1 | <?php |
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2 | /** |
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3 | * Name: When |
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4 | * Author: Thomas Planer <tplaner@gmail.com> |
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5 | * Location: http://github.com/tplaner/When |
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6 | * Created: September 2010 |
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7 | * Description: Determines the next date of recursion given an iCalendar "rrule" like pattern. |
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8 | * Requirements: PHP 5.3+ - makes extensive use of the Date and Time library (http://us2.php.net/manual/en/book.datetime.php) |
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9 | */ |
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10 | class When |
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11 | { |
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12 | protected $frequency; |
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13 | |
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14 | protected $start_date; |
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15 | protected $try_date; |
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16 | |
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17 | protected $end_date; |
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18 | |
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19 | protected $gobymonth; |
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20 | protected $bymonth; |
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21 | |
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22 | protected $gobyweekno; |
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23 | protected $byweekno; |
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24 | |
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25 | protected $gobyyearday; |
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26 | protected $byyearday; |
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27 | |
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28 | protected $gobymonthday; |
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29 | protected $bymonthday; |
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30 | |
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31 | protected $gobyday; |
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32 | protected $byday; |
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33 | |
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34 | protected $gobysetpos; |
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35 | protected $bysetpos; |
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36 | |
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37 | protected $suggestions; |
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38 | |
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39 | protected $count; |
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40 | protected $counter; |
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41 | |
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42 | protected $goenddate; |
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43 | |
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44 | protected $interval; |
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45 | |
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46 | protected $wkst; |
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47 | |
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48 | protected $valid_week_days; |
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49 | protected $valid_frequency; |
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50 | |
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51 | /** |
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52 | * __construct |
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53 | */ |
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54 | public function __construct() |
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55 | { |
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56 | $this->frequency = null; |
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57 | |
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58 | $this->gobymonth = false; |
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59 | $this->bymonth = range(1,12); |
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60 | |
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61 | $this->gobymonthday = false; |
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62 | $this->bymonthday = range(1,31); |
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63 | |
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64 | $this->gobyday = false; |
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65 | // setup the valid week days (0 = sunday) |
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66 | $this->byday = range(0,6); |
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67 | |
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68 | $this->gobyyearday = false; |
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69 | $this->byyearday = range(0,366); |
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70 | |
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71 | $this->gobysetpos = false; |
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72 | $this->bysetpos = range(1,366); |
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73 | |
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74 | $this->gobyweekno = false; |
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75 | // setup the range for valid weeks |
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76 | $this->byweekno = range(0,54); |
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77 | |
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78 | $this->suggestions = array(); |
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79 | |
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80 | // this will be set if a count() is specified |
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81 | $this->count = 0; |
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82 | // how many *valid* results we returned |
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83 | $this->counter = 0; |
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84 | |
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85 | // max date we'll return |
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86 | $this->end_date = new DateTime('9999-12-31'); |
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87 | |
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88 | // the interval to increase the pattern by |
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89 | $this->interval = 1; |
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90 | |
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91 | // what day does the week start on? (0 = sunday) |
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92 | $this->wkst = 0; |
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93 | |
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94 | $this->valid_week_days = array('SU', 'MO', 'TU', 'WE', 'TH', 'FR', 'SA'); |
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95 | |
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96 | $this->valid_frequency = array('SECONDLY', 'MINUTELY', 'HOURLY', 'DAILY', 'WEEKLY', 'MONTHLY', 'YEARLY'); |
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97 | } |
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98 | |
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99 | /** |
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100 | * @param DateTime|string $start_date of the recursion - also is the first return value. |
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101 | * @param string $frequency of the recrusion, valid frequencies: secondly, minutely, hourly, daily, weekly, monthly, yearly |
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102 | */ |
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103 | public function recur($start_date, $frequency = "daily") |
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104 | { |
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105 | try |
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106 | { |
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107 | if(is_object($start_date)) |
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108 | { |
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109 | $this->start_date = clone $start_date; |
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110 | } |
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111 | else |
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112 | { |
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113 | // timestamps within the RFC have a 'Z' at the end of them, remove this. |
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114 | $start_date = trim($start_date, 'Z'); |
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115 | $this->start_date = new DateTime($start_date); |
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116 | } |
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117 | |
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118 | $this->try_date = clone $this->start_date; |
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119 | } |
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120 | catch(Exception $e) |
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121 | { |
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122 | throw new InvalidArgumentException('Invalid start date DateTime: ' . $e); |
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123 | } |
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124 | |
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125 | $this->freq($frequency); |
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126 | |
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127 | return $this; |
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128 | } |
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129 | |
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130 | public function freq($frequency) |
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131 | { |
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132 | if(in_array(strtoupper($frequency), $this->valid_frequency)) |
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133 | { |
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134 | $this->frequency = strtoupper($frequency); |
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135 | } |
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136 | else |
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137 | { |
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138 | throw new InvalidArgumentException('Invalid frequency type.'); |
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139 | } |
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140 | |
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141 | return $this; |
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142 | } |
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143 | |
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144 | // accepts an rrule directly |
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145 | public function rrule($rrule) |
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146 | { |
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147 | // strip off a trailing semi-colon |
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148 | $rrule = trim($rrule, ";"); |
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149 | |
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150 | $parts = explode(";", $rrule); |
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151 | |
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152 | foreach($parts as $part) |
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153 | { |
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154 | list($rule, $param) = explode("=", $part); |
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155 | |
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156 | $rule = strtoupper($rule); |
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157 | $param = strtoupper($param); |
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158 | |
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159 | switch($rule) |
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160 | { |
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161 | case "FREQ": |
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162 | $this->frequency = $param; |
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163 | break; |
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164 | case "UNTIL": |
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165 | $this->until($param); |
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166 | break; |
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167 | case "COUNT": |
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168 | $this->count($param); |
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169 | break; |
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170 | case "INTERVAL": |
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171 | $this->interval($param); |
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172 | break; |
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173 | case "BYDAY": |
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174 | $params = explode(",", $param); |
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175 | $this->byday($params); |
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176 | break; |
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177 | case "BYMONTHDAY": |
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178 | $params = explode(",", $param); |
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179 | $this->bymonthday($params); |
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180 | break; |
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181 | case "BYYEARDAY": |
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182 | $params = explode(",", $param); |
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183 | $this->byyearday($params); |
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184 | break; |
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185 | case "BYWEEKNO": |
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186 | $params = explode(",", $param); |
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187 | $this->byweekno($params); |
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188 | break; |
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189 | case "BYMONTH": |
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190 | $params = explode(",", $param); |
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191 | $this->bymonth($params); |
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192 | break; |
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193 | case "BYSETPOS": |
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194 | $params = explode(",", $param); |
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195 | $this->bysetpos($params); |
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196 | break; |
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197 | case "WKST": |
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198 | $this->wkst($param); |
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199 | break; |
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200 | } |
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201 | } |
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202 | |
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203 | return $this; |
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204 | } |
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205 | |
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206 | //max number of items to return based on the pattern |
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207 | public function count($count) |
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208 | { |
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209 | $this->count = (int)$count; |
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210 | |
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211 | return $this; |
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212 | } |
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213 | |
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214 | // how often the recurrence rule repeats |
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215 | public function interval($interval) |
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216 | { |
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217 | $this->interval = (int)$interval; |
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218 | |
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219 | return $this; |
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220 | } |
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221 | |
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222 | // starting day of the week |
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223 | public function wkst($day) |
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224 | { |
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225 | switch($day) |
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226 | { |
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227 | case 'SU': |
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228 | $this->wkst = 0; |
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229 | break; |
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230 | case 'MO': |
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231 | $this->wkst = 1; |
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232 | break; |
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233 | case 'TU': |
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234 | $this->wkst = 2; |
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235 | break; |
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236 | case 'WE': |
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237 | $this->wkst = 3; |
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238 | break; |
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239 | case 'TH': |
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240 | $this->wkst = 4; |
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241 | break; |
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242 | case 'FR': |
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243 | $this->wkst = 5; |
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244 | break; |
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245 | case 'SA': |
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246 | $this->wkst = 6; |
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247 | break; |
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248 | } |
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249 | |
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250 | return $this; |
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251 | } |
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252 | |
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253 | // max date |
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254 | public function until($end_date) |
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255 | { |
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256 | try |
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257 | { |
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258 | if(is_object($end_date)) |
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259 | { |
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260 | $this->end_date = clone $end_date; |
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261 | } |
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262 | else |
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263 | { |
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264 | // timestamps within the RFC have a 'Z' at the end of them, remove this. |
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265 | $end_date = trim($end_date, 'Z'); |
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266 | $this->end_date = new DateTime($end_date); |
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267 | } |
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268 | } |
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269 | catch(Exception $e) |
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270 | { |
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271 | throw new InvalidArgumentException('Invalid end date DateTime: ' . $e); |
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272 | } |
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273 | |
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274 | return $this; |
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275 | } |
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276 | |
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277 | public function bymonth($months) |
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278 | { |
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279 | if(is_array($months)) |
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280 | { |
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281 | $this->gobymonth = true; |
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282 | $this->bymonth = $months; |
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283 | } |
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284 | |
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285 | return $this; |
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286 | } |
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287 | |
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288 | public function bymonthday($days) |
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289 | { |
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290 | if(is_array($days)) |
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291 | { |
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292 | $this->gobymonthday = true; |
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293 | $this->bymonthday = $days; |
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294 | } |
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295 | |
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296 | return $this; |
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297 | } |
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298 | |
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299 | public function byweekno($weeks) |
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300 | { |
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301 | $this->gobyweekno = true; |
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302 | |
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303 | if(is_array($weeks)) |
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304 | { |
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305 | $this->byweekno = $weeks; |
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306 | } |
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307 | |
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308 | return $this; |
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309 | } |
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310 | |
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311 | public function bysetpos($days) |
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312 | { |
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313 | $this->gobysetpos = true; |
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314 | |
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315 | if(is_array($days)) |
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316 | { |
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317 | $this->bysetpos = $days; |
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318 | } |
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319 | |
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320 | return $this; |
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321 | } |
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322 | |
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323 | public function byday($days) |
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324 | { |
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325 | $this->gobyday = true; |
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326 | |
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327 | if(is_array($days)) |
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328 | { |
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329 | $this->byday = array(); |
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330 | foreach($days as $day) |
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331 | { |
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332 | $len = strlen($day); |
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333 | |
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334 | $as = '+'; |
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335 | |
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336 | // 0 mean no occurence is set |
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337 | $occ = 0; |
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338 | |
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339 | if($len == 3) |
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340 | { |
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341 | $occ = substr($day, 0, 1); |
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342 | } |
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343 | if($len == 4) |
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344 | { |
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345 | $as = substr($day, 0, 1); |
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346 | $occ = substr($day, 1, 1); |
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347 | } |
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348 | |
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349 | if($as == '-') |
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350 | { |
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351 | $occ = '-' . $occ; |
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352 | } |
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353 | else |
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354 | { |
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355 | $occ = '+' . $occ; |
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356 | } |
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357 | |
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358 | $day = substr($day, -2, 2); |
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359 | switch($day) |
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360 | { |
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361 | case 'SU': |
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362 | $this->byday[] = $occ . 'SU'; |
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363 | break; |
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364 | case 'MO': |
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365 | $this->byday[] = $occ . 'MO'; |
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366 | break; |
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367 | case 'TU': |
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368 | $this->byday[] = $occ . 'TU'; |
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369 | break; |
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370 | case 'WE': |
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371 | $this->byday[] = $occ . 'WE'; |
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372 | break; |
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373 | case 'TH': |
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374 | $this->byday[] = $occ . 'TH'; |
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375 | break; |
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376 | case 'FR': |
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377 | $this->byday[] = $occ . 'FR'; |
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378 | break; |
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379 | case 'SA': |
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380 | $this->byday[] = $occ . 'SA'; |
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381 | break; |
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382 | } |
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383 | } |
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384 | } |
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385 | |
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386 | return $this; |
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387 | } |
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388 | |
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389 | public function byyearday($days) |
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390 | { |
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391 | $this->gobyyearday = true; |
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392 | |
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393 | if(is_array($days)) |
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394 | { |
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395 | $this->byyearday = $days; |
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396 | } |
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397 | |
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398 | return $this; |
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399 | } |
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400 | |
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401 | // this creates a basic list of dates to "try" |
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402 | protected function create_suggestions() |
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403 | { |
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404 | switch($this->frequency) |
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405 | { |
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406 | case "YEARLY": |
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407 | $interval = 'year'; |
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408 | break; |
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409 | case "MONTHLY": |
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410 | $interval = 'month'; |
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411 | break; |
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412 | case "WEEKLY": |
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413 | $interval = 'week'; |
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414 | break; |
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415 | case "DAILY": |
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416 | $interval = 'day'; |
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417 | break; |
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418 | case "HOURLY": |
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419 | $interval = 'hour'; |
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420 | break; |
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421 | case "MINUTELY": |
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422 | $interval = 'minute'; |
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423 | break; |
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424 | case "SECONDLY": |
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425 | $interval = 'second'; |
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426 | break; |
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427 | } |
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428 | |
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429 | $month_day = $this->try_date->format('j'); |
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430 | $month = $this->try_date->format('n'); |
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431 | $year = $this->try_date->format('Y'); |
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432 | |
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433 | $timestamp = $this->try_date->format('H:i:s'); |
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434 | |
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435 | if($this->gobysetpos) |
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436 | { |
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437 | if($this->try_date == $this->start_date) |
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438 | { |
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439 | $this->suggestions[] = clone $this->try_date; |
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440 | } |
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441 | else |
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442 | { |
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443 | if($this->gobyday) |
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444 | { |
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445 | foreach($this->bysetpos as $_pos) |
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446 | { |
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447 | $tmp_array = array(); |
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448 | $_mdays = range(1, date('t',mktime(0,0,0,$month,1,$year))); |
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449 | foreach($_mdays as $_mday) |
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450 | { |
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451 | $date_time = new DateTime($year . '-' . $month . '-' . $_mday . ' ' . $timestamp); |
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452 | |
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453 | $occur = ceil($_mday / 7); |
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454 | |
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455 | $day_of_week = $date_time->format('l'); |
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456 | $dow_abr = strtoupper(substr($day_of_week, 0, 2)); |
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457 | |
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458 | // set the day of the month + (positive) |
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459 | $occur = '+' . $occur . $dow_abr; |
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460 | $occur_zero = '+0' . $dow_abr; |
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461 | |
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462 | // set the day of the month - (negative) |
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463 | $total_days = $date_time->format('t') - $date_time->format('j'); |
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464 | $occur_neg = '-' . ceil(($total_days + 1)/7) . $dow_abr; |
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465 | |
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466 | $day_from_end_of_month = $date_time->format('t') + 1 - $_mday; |
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467 | |
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468 | if(in_array($occur, $this->byday) || in_array($occur_zero, $this->byday) || in_array($occur_neg, $this->byday)) |
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469 | { |
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470 | $tmp_array[] = clone $date_time; |
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471 | } |
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472 | } |
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473 | |
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474 | if($_pos > 0) |
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475 | { |
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476 | $this->suggestions[] = clone $tmp_array[$_pos - 1]; |
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477 | } |
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478 | else |
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479 | { |
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480 | $this->suggestions[] = clone $tmp_array[count($tmp_array) + $_pos]; |
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481 | } |
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482 | |
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483 | } |
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484 | } |
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485 | } |
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486 | } |
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487 | elseif($this->gobyyearday) |
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488 | { |
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489 | foreach($this->byyearday as $_day) |
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490 | { |
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491 | if($_day >= 0) |
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492 | { |
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493 | $_day--; |
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494 | |
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495 | $_time = strtotime('+' . $_day . ' days', mktime(0, 0, 0, 1, 1, $year)); |
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496 | $this->suggestions[] = new Datetime(date('Y-m-d', $_time) . ' ' . $timestamp); |
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497 | } |
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498 | else |
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499 | { |
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500 | $year_day_neg = 365 + $_day; |
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501 | $leap_year = $this->try_date->format('L'); |
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502 | if($leap_year == 1) |
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503 | { |
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504 | $year_day_neg = 366 + $_day; |
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505 | } |
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506 | |
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507 | $_time = strtotime('+' . $year_day_neg . ' days', mktime(0, 0, 0, 1, 1, $year)); |
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508 | $this->suggestions[] = new Datetime(date('Y-m-d', $_time) . ' ' . $timestamp); |
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509 | } |
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510 | } |
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511 | } |
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512 | // special case because for years you need to loop through the months too |
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513 | elseif($this->gobyday && $interval == "year") |
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514 | { |
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515 | foreach($this->bymonth as $_month) |
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516 | { |
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517 | // this creates an array of days of the month |
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518 | $_mdays = range(1, date('t',mktime(0,0,0,$_month,1,$year))); |
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519 | foreach($_mdays as $_mday) |
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520 | { |
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521 | $date_time = new DateTime($year . '-' . $_month . '-' . $_mday . ' ' . $timestamp); |
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522 | |
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523 | // get the week of the month (1, 2, 3, 4, 5, etc) |
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524 | $week = $date_time->format('W'); |
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525 | |
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526 | if($date_time >= $this->start_date && in_array($week, $this->byweekno)) |
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527 | { |
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528 | $this->suggestions[] = clone $date_time; |
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529 | } |
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530 | } |
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531 | } |
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532 | } |
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533 | elseif($interval == "day") |
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534 | { |
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535 | $this->suggestions[] = clone $this->try_date; |
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536 | } |
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537 | elseif($interval == "week") |
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538 | { |
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539 | $this->suggestions[] = clone $this->try_date; |
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540 | |
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541 | if($this->gobyday) |
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542 | { |
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543 | $week_day = $this->try_date->format('w'); |
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544 | |
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545 | $days_in_month = $this->try_date->format('t'); |
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546 | |
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547 | $overflow_count = 1; |
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548 | $_day = $month_day; |
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549 | |
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550 | $run = true; |
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551 | while($run) |
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552 | { |
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553 | ++$_day; |
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554 | if($_day <= $days_in_month) |
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555 | { |
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556 | $tmp_date = new DateTime($year . '-' . $month . '-' . $_day . ' ' . $timestamp); |
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557 | } |
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558 | else |
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559 | { |
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560 | //$tmp_month = $month+1; |
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561 | $tmp_date = new DateTime($year . '-' . $month . '-' . $overflow_count . ' ' . $timestamp); |
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562 | $tmp_date->modify('+1 month'); |
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563 | ++$overflow_count; |
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564 | } |
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565 | |
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566 | $week_day = $tmp_date->format('w'); |
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567 | |
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568 | if($this->try_date == $this->start_date) |
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569 | { |
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570 | if($week_day == $this->wkst) |
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571 | { |
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572 | $this->try_date = clone $tmp_date; |
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573 | $this->try_date->modify('-7 days'); |
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574 | $run = false; |
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575 | } |
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576 | } |
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577 | |
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578 | if($week_day != $this->wkst) |
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579 | { |
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580 | $this->suggestions[] = clone $tmp_date; |
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581 | } |
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582 | else |
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583 | { |
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584 | $run = false; |
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585 | } |
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586 | } |
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587 | } |
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588 | } |
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589 | elseif($this->gobyday || $interval == "month") |
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590 | { |
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591 | $_mdays = range(1, date('t',mktime(0,0,0,$month,1,$year))); |
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592 | foreach($_mdays as $_mday) |
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593 | { |
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594 | $date_time = new DateTime($year . '-' . $month . '-' . $_mday . ' ' . $timestamp); |
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595 | |
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596 | // get the week of the month (1, 2, 3, 4, 5, etc) |
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597 | $week = $date_time->format('W'); |
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598 | |
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599 | if($date_time >= $this->start_date && in_array($week, $this->byweekno)) |
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600 | { |
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601 | $this->suggestions[] = clone $date_time; |
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602 | } |
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603 | } |
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604 | } |
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605 | elseif($this->gobymonth) |
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606 | { |
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607 | foreach($this->bymonth as $_month) |
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608 | { |
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609 | $date_time = new DateTime($year . '-' . $_month . '-' . $month_day . ' ' . $timestamp); |
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610 | |
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611 | if($date_time >= $this->start_date) |
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612 | { |
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613 | $this->suggestions[] = clone $date_time; |
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614 | } |
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615 | } |
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616 | } |
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617 | else |
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618 | { |
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619 | $this->suggestions[] = clone $this->try_date; |
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620 | } |
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621 | |
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622 | if($interval == "month") |
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623 | { |
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624 | $this->try_date->modify('last day of ' . $this->interval . ' ' . $interval); |
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625 | } |
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626 | else |
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627 | { |
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628 | $this->try_date->modify($this->interval . ' ' . $interval); |
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629 | } |
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630 | } |
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631 | |
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632 | protected function valid_date($date) |
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633 | { |
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634 | $year = $date->format('Y'); |
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635 | $month = $date->format('n'); |
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636 | $day = $date->format('j'); |
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637 | |
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638 | $year_day = $date->format('z') + 1; |
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639 | |
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640 | $year_day_neg = -366 + $year_day; |
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641 | $leap_year = $date->format('L'); |
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642 | if($leap_year == 1) |
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643 | { |
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644 | $year_day_neg = -367 + $year_day; |
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645 | } |
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646 | |
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647 | // this is the nth occurence of the date |
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648 | $occur = ceil($day / 7); |
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649 | |
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650 | $week = $date->format('W'); |
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651 | |
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652 | $day_of_week = $date->format('l'); |
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653 | $dow_abr = strtoupper(substr($day_of_week, 0, 2)); |
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654 | |
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655 | // set the day of the month + (positive) |
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656 | $occur = '+' . $occur . $dow_abr; |
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657 | $occur_zero = '+0' . $dow_abr; |
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658 | |
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659 | // set the day of the month - (negative) |
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660 | $total_days = $date->format('t') - $date->format('j'); |
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661 | $occur_neg = '-' . ceil(($total_days + 1)/7) . $dow_abr; |
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662 | |
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663 | $day_from_end_of_month = $date->format('t') + 1 - $day; |
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664 | |
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665 | if(in_array($month, $this->bymonth) && |
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666 | (in_array($occur, $this->byday) || in_array($occur_zero, $this->byday) || in_array($occur_neg, $this->byday)) && |
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667 | in_array($week, $this->byweekno) && |
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668 | (in_array($day, $this->bymonthday) || in_array(-$day_from_end_of_month, $this->bymonthday)) && |
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669 | (in_array($year_day, $this->byyearday) || in_array($year_day_neg, $this->byyearday))) |
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670 | { |
---|
671 | return true; |
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672 | } |
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673 | else |
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674 | { |
---|
675 | return false; |
---|
676 | } |
---|
677 | } |
---|
678 | |
---|
679 | // return the next valid DateTime object which matches the pattern and follows the rules |
---|
680 | public function next() |
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681 | { |
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682 | // check the counter is set |
---|
683 | if($this->count !== 0) |
---|
684 | { |
---|
685 | if($this->counter >= $this->count) |
---|
686 | { |
---|
687 | return false; |
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688 | } |
---|
689 | } |
---|
690 | |
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691 | // create initial set of suggested dates |
---|
692 | if(count($this->suggestions) === 0) |
---|
693 | { |
---|
694 | $this->create_suggestions(); |
---|
695 | } |
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696 | |
---|
697 | // loop through the suggested dates |
---|
698 | while(count($this->suggestions) > 0) |
---|
699 | { |
---|
700 | // get the first one on the array |
---|
701 | $try_date = array_shift($this->suggestions); |
---|
702 | |
---|
703 | // make sure the date doesn't exceed the max date |
---|
704 | if($try_date > $this->end_date) |
---|
705 | { |
---|
706 | return false; |
---|
707 | } |
---|
708 | |
---|
709 | // make sure it falls within the allowed days |
---|
710 | if($this->valid_date($try_date) === true) |
---|
711 | { |
---|
712 | $this->counter++; |
---|
713 | return $try_date; |
---|
714 | } |
---|
715 | else |
---|
716 | { |
---|
717 | // we might be out of suggested days, so load some more |
---|
718 | if(count($this->suggestions) === 0) |
---|
719 | { |
---|
720 | $this->create_suggestions(); |
---|
721 | } |
---|
722 | } |
---|
723 | } |
---|
724 | } |
---|
725 | } |
---|