1 | <?php |
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2 | /* |
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3 | V4.93 10 Oct 2006 (c) 2000-2007 John Lim (jlim#natsoft.com.my). All rights reserved. |
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4 | Released under both BSD license and Lesser GPL library license. |
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5 | Whenever there is any discrepancy between the two licenses, |
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6 | the BSD license will take precedence. |
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7 | Set tabs to 4 for best viewing. |
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8 | |
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9 | Latest version of ADODB is available at http://php.weblogs.com/adodb |
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10 | ====================================================================== |
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11 | |
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12 | This file provides PHP4 session management using the ADODB database |
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13 | wrapper library, using Oracle CLOB's to store data. Contributed by achim.gosse@ddd.de. |
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14 | |
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15 | Example |
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16 | ======= |
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17 | |
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18 | include('adodb.inc.php'); |
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19 | include('adodb-session.php'); |
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20 | session_start(); |
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21 | session_register('AVAR'); |
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22 | $_SESSION['AVAR'] += 1; |
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23 | print " |
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24 | -- \$_SESSION['AVAR']={$_SESSION['AVAR']}</p>"; |
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25 | |
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26 | To force non-persistent connections, call adodb_session_open first before session_start(): |
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27 | |
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28 | include('adodb.inc.php'); |
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29 | include('adodb-session.php'); |
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30 | adodb_session_open(false,false,false); |
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31 | session_start(); |
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32 | session_register('AVAR'); |
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33 | $_SESSION['AVAR'] += 1; |
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34 | print " |
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35 | -- \$_SESSION['AVAR']={$_SESSION['AVAR']}</p>"; |
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36 | |
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37 | |
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38 | Installation |
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39 | ============ |
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40 | 1. Create this table in your database (syntax might vary depending on your db): |
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41 | |
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42 | create table sessions ( |
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43 | SESSKEY char(32) not null, |
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44 | EXPIRY int(11) unsigned not null, |
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45 | EXPIREREF varchar(64), |
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46 | DATA CLOB, |
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47 | primary key (sesskey) |
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48 | ); |
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49 | |
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50 | |
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51 | 2. Then define the following parameters in this file: |
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52 | $ADODB_SESSION_DRIVER='database driver, eg. mysql or ibase'; |
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53 | $ADODB_SESSION_CONNECT='server to connect to'; |
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54 | $ADODB_SESSION_USER ='user'; |
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55 | $ADODB_SESSION_PWD ='password'; |
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56 | $ADODB_SESSION_DB ='database'; |
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57 | $ADODB_SESSION_TBL = 'sessions' |
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58 | $ADODB_SESSION_USE_LOBS = false; (or, if you wanna use CLOBS (= 'CLOB') or ( = 'BLOB') |
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59 | |
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60 | 3. Recommended is PHP 4.1.0 or later. There are documented |
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61 | session bugs in earlier versions of PHP. |
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62 | |
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63 | 4. If you want to receive notifications when a session expires, then |
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64 | you can tag a session with an EXPIREREF, and before the session |
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65 | record is deleted, we can call a function that will pass the EXPIREREF |
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66 | as the first parameter, and the session key as the second parameter. |
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67 | |
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68 | To do this, define a notification function, say NotifyFn: |
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69 | |
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70 | function NotifyFn($expireref, $sesskey) |
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71 | { |
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72 | } |
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73 | |
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74 | Then you need to define a global variable $ADODB_SESSION_EXPIRE_NOTIFY. |
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75 | This is an array with 2 elements, the first being the name of the variable |
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76 | you would like to store in the EXPIREREF field, and the 2nd is the |
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77 | notification function's name. |
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78 | |
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79 | In this example, we want to be notified when a user's session |
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80 | has expired, so we store the user id in the global variable $USERID, |
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81 | store this value in the EXPIREREF field: |
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82 | |
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83 | $ADODB_SESSION_EXPIRE_NOTIFY = array('USERID','NotifyFn'); |
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84 | |
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85 | Then when the NotifyFn is called, we are passed the $USERID as the first |
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86 | parameter, eg. NotifyFn($userid, $sesskey). |
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87 | */ |
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88 | |
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89 | if (!defined('_ADODB_LAYER')) { |
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90 | include (dirname(__FILE__).'/adodb.inc.php'); |
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91 | } |
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92 | |
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93 | if (!defined('ADODB_SESSION')) { |
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94 | |
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95 | define('ADODB_SESSION',1); |
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96 | |
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97 | /* if database time and system time is difference is greater than this, then give warning */ |
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98 | define('ADODB_SESSION_SYNCH_SECS',60); |
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99 | |
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100 | /****************************************************************************************\ |
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101 | Global definitions |
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102 | \****************************************************************************************/ |
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103 | GLOBAL $ADODB_SESSION_CONNECT, |
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104 | $ADODB_SESSION_DRIVER, |
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105 | $ADODB_SESSION_USER, |
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106 | $ADODB_SESSION_PWD, |
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107 | $ADODB_SESSION_DB, |
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108 | $ADODB_SESS_CONN, |
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109 | $ADODB_SESS_LIFE, |
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110 | $ADODB_SESS_DEBUG, |
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111 | $ADODB_SESSION_EXPIRE_NOTIFY, |
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112 | $ADODB_SESSION_CRC, |
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113 | $ADODB_SESSION_USE_LOBS, |
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114 | $ADODB_SESSION_TBL; |
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115 | |
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116 | if (!isset($ADODB_SESSION_USE_LOBS)) $ADODB_SESSION_USE_LOBS = 'CLOB'; |
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117 | |
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118 | $ADODB_SESS_LIFE = ini_get('session.gc_maxlifetime'); |
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119 | if ($ADODB_SESS_LIFE <= 1) { |
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120 | // bug in PHP 4.0.3 pl 1 -- how about other versions? |
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121 | //print "<h3>Session Error: PHP.INI setting <i>session.gc_maxlifetime</i>not set: $ADODB_SESS_LIFE</h3>"; |
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122 | $ADODB_SESS_LIFE=1440; |
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123 | } |
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124 | $ADODB_SESSION_CRC = false; |
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125 | //$ADODB_SESS_DEBUG = true; |
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126 | |
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127 | ////////////////////////////////// |
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128 | /* SET THE FOLLOWING PARAMETERS */ |
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129 | ////////////////////////////////// |
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130 | |
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131 | if (empty($ADODB_SESSION_DRIVER)) { |
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132 | $ADODB_SESSION_DRIVER='mysql'; |
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133 | $ADODB_SESSION_CONNECT='localhost'; |
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134 | $ADODB_SESSION_USER ='root'; |
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135 | $ADODB_SESSION_PWD =''; |
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136 | $ADODB_SESSION_DB ='xphplens_2'; |
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137 | } |
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138 | |
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139 | if (empty($ADODB_SESSION_EXPIRE_NOTIFY)) { |
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140 | $ADODB_SESSION_EXPIRE_NOTIFY = false; |
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141 | } |
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142 | // Made table name configurable - by David Johnson djohnson@inpro.net |
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143 | if (empty($ADODB_SESSION_TBL)){ |
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144 | $ADODB_SESSION_TBL = 'sessions'; |
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145 | } |
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146 | |
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147 | |
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148 | // defaulting $ADODB_SESSION_USE_LOBS |
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149 | if (!isset($ADODB_SESSION_USE_LOBS) || empty($ADODB_SESSION_USE_LOBS)) { |
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150 | $ADODB_SESSION_USE_LOBS = false; |
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151 | } |
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152 | |
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153 | /* |
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154 | $ADODB_SESS['driver'] = $ADODB_SESSION_DRIVER; |
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155 | $ADODB_SESS['connect'] = $ADODB_SESSION_CONNECT; |
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156 | $ADODB_SESS['user'] = $ADODB_SESSION_USER; |
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157 | $ADODB_SESS['pwd'] = $ADODB_SESSION_PWD; |
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158 | $ADODB_SESS['db'] = $ADODB_SESSION_DB; |
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159 | $ADODB_SESS['life'] = $ADODB_SESS_LIFE; |
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160 | $ADODB_SESS['debug'] = $ADODB_SESS_DEBUG; |
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161 | |
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162 | $ADODB_SESS['debug'] = $ADODB_SESS_DEBUG; |
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163 | $ADODB_SESS['table'] = $ADODB_SESS_TBL; |
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164 | */ |
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165 | |
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166 | /****************************************************************************************\ |
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167 | Create the connection to the database. |
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168 | |
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169 | If $ADODB_SESS_CONN already exists, reuse that connection |
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170 | \****************************************************************************************/ |
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171 | function adodb_sess_open($save_path, $session_name,$persist=true) |
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172 | { |
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173 | GLOBAL $ADODB_SESS_CONN; |
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174 | if (isset($ADODB_SESS_CONN)) return true; |
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175 | |
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176 | GLOBAL $ADODB_SESSION_CONNECT, |
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177 | $ADODB_SESSION_DRIVER, |
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178 | $ADODB_SESSION_USER, |
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179 | $ADODB_SESSION_PWD, |
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180 | $ADODB_SESSION_DB, |
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181 | $ADODB_SESS_DEBUG; |
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182 | |
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183 | // cannot use & below - do not know why... |
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184 | $ADODB_SESS_CONN = ADONewConnection($ADODB_SESSION_DRIVER); |
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185 | if (!empty($ADODB_SESS_DEBUG)) { |
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186 | $ADODB_SESS_CONN->debug = true; |
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187 | ADOConnection::outp( " conn=$ADODB_SESSION_CONNECT user=$ADODB_SESSION_USER pwd=$ADODB_SESSION_PWD db=$ADODB_SESSION_DB "); |
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188 | } |
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189 | if ($persist) $ok = $ADODB_SESS_CONN->PConnect($ADODB_SESSION_CONNECT, |
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190 | $ADODB_SESSION_USER,$ADODB_SESSION_PWD,$ADODB_SESSION_DB); |
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191 | else $ok = $ADODB_SESS_CONN->Connect($ADODB_SESSION_CONNECT, |
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192 | $ADODB_SESSION_USER,$ADODB_SESSION_PWD,$ADODB_SESSION_DB); |
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193 | |
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194 | if (!$ok) ADOConnection::outp( " |
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195 | -- Session: connection failed</p>",false); |
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196 | } |
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197 | |
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198 | /****************************************************************************************\ |
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199 | Close the connection |
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200 | \****************************************************************************************/ |
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201 | function adodb_sess_close() |
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202 | { |
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203 | global $ADODB_SESS_CONN; |
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204 | |
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205 | if ($ADODB_SESS_CONN) $ADODB_SESS_CONN->Close(); |
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206 | return true; |
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207 | } |
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208 | |
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209 | /****************************************************************************************\ |
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210 | Slurp in the session variables and return the serialized string |
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211 | \****************************************************************************************/ |
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212 | function adodb_sess_read($key) |
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213 | { |
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214 | global $ADODB_SESS_CONN,$ADODB_SESSION_TBL,$ADODB_SESSION_CRC; |
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215 | |
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216 | $rs = $ADODB_SESS_CONN->Execute("SELECT data FROM $ADODB_SESSION_TBL WHERE sesskey = '$key' AND expiry >= " . time()); |
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217 | if ($rs) { |
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218 | if ($rs->EOF) { |
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219 | $v = ''; |
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220 | } else |
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221 | $v = rawurldecode(reset($rs->fields)); |
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222 | |
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223 | $rs->Close(); |
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224 | |
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225 | // new optimization adodb 2.1 |
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226 | $ADODB_SESSION_CRC = strlen($v).crc32($v); |
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227 | |
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228 | return $v; |
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229 | } |
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230 | |
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231 | return ''; // thx to Jorma Tuomainen, webmaster#wizactive.com |
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232 | } |
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233 | |
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234 | /****************************************************************************************\ |
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235 | Write the serialized data to a database. |
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236 | |
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237 | If the data has not been modified since adodb_sess_read(), we do not write. |
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238 | \****************************************************************************************/ |
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239 | function adodb_sess_write($key, $val) |
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240 | { |
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241 | global |
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242 | $ADODB_SESS_CONN, |
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243 | $ADODB_SESS_LIFE, |
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244 | $ADODB_SESSION_TBL, |
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245 | $ADODB_SESS_DEBUG, |
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246 | $ADODB_SESSION_CRC, |
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247 | $ADODB_SESSION_EXPIRE_NOTIFY, |
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248 | $ADODB_SESSION_DRIVER, // added |
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249 | $ADODB_SESSION_USE_LOBS; // added |
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250 | |
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251 | $expiry = time() + $ADODB_SESS_LIFE; |
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252 | |
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253 | // crc32 optimization since adodb 2.1 |
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254 | // now we only update expiry date, thx to sebastian thom in adodb 2.32 |
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255 | if ($ADODB_SESSION_CRC !== false && $ADODB_SESSION_CRC == strlen($val).crc32($val)) { |
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256 | if ($ADODB_SESS_DEBUG) echo " |
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257 | -- Session: Only updating date - crc32 not changed</p>"; |
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258 | $qry = "UPDATE $ADODB_SESSION_TBL SET expiry=$expiry WHERE sesskey='$key' AND expiry >= " . time(); |
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259 | $rs = $ADODB_SESS_CONN->Execute($qry); |
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260 | return true; |
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261 | } |
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262 | $val = rawurlencode($val); |
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263 | |
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264 | $arr = array('sesskey' => $key, 'expiry' => $expiry, 'data' => $val); |
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265 | if ($ADODB_SESSION_EXPIRE_NOTIFY) { |
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266 | $var = reset($ADODB_SESSION_EXPIRE_NOTIFY); |
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267 | global $$var; |
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268 | $arr['expireref'] = $$var; |
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269 | } |
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270 | |
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271 | |
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272 | if ($ADODB_SESSION_USE_LOBS === false) { // no lobs, simply use replace() |
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273 | $rs = $ADODB_SESS_CONN->Replace($ADODB_SESSION_TBL,$arr, 'sesskey',$autoQuote = true); |
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274 | if (!$rs) { |
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275 | $err = $ADODB_SESS_CONN->ErrorMsg(); |
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276 | } |
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277 | } else { |
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278 | // what value shall we insert/update for lob row? |
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279 | switch ($ADODB_SESSION_DRIVER) { |
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280 | // empty_clob or empty_lob for oracle dbs |
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281 | case "oracle": |
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282 | case "oci8": |
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283 | case "oci8po": |
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284 | case "oci805": |
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285 | $lob_value = sprintf("empty_%s()", strtolower($ADODB_SESSION_USE_LOBS)); |
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286 | break; |
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287 | |
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288 | // null for all other |
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289 | default: |
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290 | $lob_value = "null"; |
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291 | break; |
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292 | } |
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293 | |
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294 | // do we insert or update? => as for sesskey |
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295 | $res = $ADODB_SESS_CONN->Execute("select count(*) as cnt from $ADODB_SESSION_TBL where sesskey = '$key'"); |
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296 | if ($res && reset($res->fields) > 0) { |
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297 | $qry = sprintf("update %s set expiry = %d, data = %s where sesskey = '%s'", $ADODB_SESSION_TBL, $expiry, $lob_value, $key); |
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298 | } else { |
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299 | // insert |
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300 | $qry = sprintf("insert into %s (sesskey, expiry, data) values ('%s', %d, %s)", $ADODB_SESSION_TBL, $key, $expiry, $lob_value); |
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301 | } |
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302 | |
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303 | $err = ""; |
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304 | $rs1 = $ADODB_SESS_CONN->Execute($qry); |
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305 | if (!$rs1) { |
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306 | $err .= $ADODB_SESS_CONN->ErrorMsg()."\n"; |
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307 | } |
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308 | $rs2 = $ADODB_SESS_CONN->UpdateBlob($ADODB_SESSION_TBL, 'data', $val, "sesskey='$key'", strtoupper($ADODB_SESSION_USE_LOBS)); |
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309 | if (!$rs2) { |
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310 | $err .= $ADODB_SESS_CONN->ErrorMsg()."\n"; |
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311 | } |
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312 | $rs = ($rs1 && $rs2) ? true : false; |
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313 | } |
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314 | |
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315 | if (!$rs) { |
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316 | ADOConnection::outp( ' |
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317 | -- Session Replace: '.nl2br($err).'</p>',false); |
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318 | } else { |
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319 | // bug in access driver (could be odbc?) means that info is not commited |
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320 | // properly unless select statement executed in Win2000 |
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321 | if ($ADODB_SESS_CONN->databaseType == 'access') |
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322 | $rs = $ADODB_SESS_CONN->Execute("select sesskey from $ADODB_SESSION_TBL WHERE sesskey='$key'"); |
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323 | } |
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324 | return !empty($rs); |
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325 | } |
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326 | |
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327 | function adodb_sess_destroy($key) |
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328 | { |
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329 | global $ADODB_SESS_CONN, $ADODB_SESSION_TBL,$ADODB_SESSION_EXPIRE_NOTIFY; |
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330 | |
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331 | if ($ADODB_SESSION_EXPIRE_NOTIFY) { |
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332 | reset($ADODB_SESSION_EXPIRE_NOTIFY); |
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333 | $fn = next($ADODB_SESSION_EXPIRE_NOTIFY); |
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334 | $savem = $ADODB_SESS_CONN->SetFetchMode(ADODB_FETCH_NUM); |
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335 | $rs = $ADODB_SESS_CONN->Execute("SELECT expireref,sesskey FROM $ADODB_SESSION_TBL WHERE sesskey='$key'"); |
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336 | $ADODB_SESS_CONN->SetFetchMode($savem); |
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337 | if ($rs) { |
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338 | $ADODB_SESS_CONN->BeginTrans(); |
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339 | while (!$rs->EOF) { |
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340 | $ref = $rs->fields[0]; |
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341 | $key = $rs->fields[1]; |
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342 | $fn($ref,$key); |
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343 | $del = $ADODB_SESS_CONN->Execute("DELETE FROM $ADODB_SESSION_TBL WHERE sesskey='$key'"); |
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344 | $rs->MoveNext(); |
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345 | } |
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346 | $ADODB_SESS_CONN->CommitTrans(); |
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347 | } |
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348 | } else { |
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349 | $qry = "DELETE FROM $ADODB_SESSION_TBL WHERE sesskey = '$key'"; |
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350 | $rs = $ADODB_SESS_CONN->Execute($qry); |
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351 | } |
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352 | return $rs ? true : false; |
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353 | } |
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354 | |
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355 | function adodb_sess_gc($maxlifetime) |
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356 | { |
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357 | global $ADODB_SESS_DEBUG, $ADODB_SESS_CONN, $ADODB_SESSION_TBL,$ADODB_SESSION_EXPIRE_NOTIFY; |
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358 | |
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359 | if ($ADODB_SESSION_EXPIRE_NOTIFY) { |
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360 | reset($ADODB_SESSION_EXPIRE_NOTIFY); |
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361 | $fn = next($ADODB_SESSION_EXPIRE_NOTIFY); |
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362 | $savem = $ADODB_SESS_CONN->SetFetchMode(ADODB_FETCH_NUM); |
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363 | $t = time(); |
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364 | $rs = $ADODB_SESS_CONN->Execute("SELECT expireref,sesskey FROM $ADODB_SESSION_TBL WHERE expiry < $t"); |
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365 | $ADODB_SESS_CONN->SetFetchMode($savem); |
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366 | if ($rs) { |
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367 | $ADODB_SESS_CONN->BeginTrans(); |
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368 | while (!$rs->EOF) { |
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369 | $ref = $rs->fields[0]; |
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370 | $key = $rs->fields[1]; |
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371 | $fn($ref,$key); |
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372 | $del = $ADODB_SESS_CONN->Execute("DELETE FROM $ADODB_SESSION_TBL WHERE sesskey='$key'"); |
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373 | $rs->MoveNext(); |
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374 | } |
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375 | $rs->Close(); |
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376 | |
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377 | //$ADODB_SESS_CONN->Execute("DELETE FROM $ADODB_SESSION_TBL WHERE expiry < $t"); |
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378 | $ADODB_SESS_CONN->CommitTrans(); |
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379 | |
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380 | } |
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381 | } else { |
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382 | $ADODB_SESS_CONN->Execute("DELETE FROM $ADODB_SESSION_TBL WHERE expiry < " . time()); |
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383 | |
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384 | if ($ADODB_SESS_DEBUG) ADOConnection::outp(" |
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385 | -- <b>Garbage Collection</b>: $qry</p>"); |
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386 | } |
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387 | // suggested by Cameron, "GaM3R" <gamr@outworld.cx> |
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388 | if (defined('ADODB_SESSION_OPTIMIZE')) { |
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389 | global $ADODB_SESSION_DRIVER; |
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390 | |
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391 | switch( $ADODB_SESSION_DRIVER ) { |
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392 | case 'mysql': |
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393 | case 'mysqlt': |
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394 | $opt_qry = 'OPTIMIZE TABLE '.$ADODB_SESSION_TBL; |
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395 | break; |
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396 | case 'postgresql': |
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397 | case 'postgresql7': |
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398 | $opt_qry = 'VACUUM '.$ADODB_SESSION_TBL; |
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399 | break; |
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400 | } |
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401 | if (!empty($opt_qry)) { |
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402 | $ADODB_SESS_CONN->Execute($opt_qry); |
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403 | } |
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404 | } |
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405 | if ($ADODB_SESS_CONN->dataProvider === 'oci8') $sql = 'select TO_CHAR('.($ADODB_SESS_CONN->sysTimeStamp).', \'RRRR-MM-DD HH24:MI:SS\') from '. $ADODB_SESSION_TBL; |
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406 | else $sql = 'select '.$ADODB_SESS_CONN->sysTimeStamp.' from '. $ADODB_SESSION_TBL; |
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407 | |
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408 | $rs =& $ADODB_SESS_CONN->SelectLimit($sql,1); |
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409 | if ($rs && !$rs->EOF) { |
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410 | |
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411 | $dbts = reset($rs->fields); |
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412 | $rs->Close(); |
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413 | $dbt = $ADODB_SESS_CONN->UnixTimeStamp($dbts); |
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414 | $t = time(); |
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415 | if (abs($dbt - $t) >= ADODB_SESSION_SYNCH_SECS) { |
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416 | $msg = |
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417 | __FILE__.": Server time for webserver {$_SERVER['HTTP_HOST']} not in synch with database: database=$dbt ($dbts), webserver=$t (diff=".(abs($dbt-$t)/3600)." hrs)"; |
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418 | error_log($msg); |
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419 | if ($ADODB_SESS_DEBUG) ADOConnection::outp(" |
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420 | -- $msg</p>"); |
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421 | } |
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422 | } |
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423 | |
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424 | return true; |
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425 | } |
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426 | |
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427 | session_module_name('user'); |
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428 | session_set_save_handler( |
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429 | "adodb_sess_open", |
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430 | "adodb_sess_close", |
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431 | "adodb_sess_read", |
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432 | "adodb_sess_write", |
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433 | "adodb_sess_destroy", |
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434 | "adodb_sess_gc"); |
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435 | } |
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436 | |
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437 | /* TEST SCRIPT -- UNCOMMENT */ |
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438 | |
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439 | if (0) { |
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440 | |
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441 | session_start(); |
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442 | session_register('AVAR'); |
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443 | $_SESSION['AVAR'] += 1; |
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444 | ADOConnection::outp( " |
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445 | -- \$_SESSION['AVAR']={$_SESSION['AVAR']}</p>",false); |
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446 | } |
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447 | |
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448 | ?> |
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