1 | <?php |
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2 | /****************************************************************** |
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3 | Projectname: CAPTCHA class |
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4 | Version: 1.1 |
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5 | Author: Pascal Rehfeldt <Pascal@Pascal-Rehfeldt.com> |
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6 | Last modified: 15. March 2004 |
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7 | Copyright (C): 2003, 2004 Pascal Rehfeldt, all rights reserved |
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8 | |
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9 | * GNU General Public License (Version 2, June 1991) |
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10 | * |
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11 | * This program is free software; you can redistribute |
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12 | * it and/or modify it under the terms of the GNU |
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13 | * General Public License as published by the Free |
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14 | * Software Foundation; either version 2 of the License, |
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15 | * or (at your option) any later version. |
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16 | * |
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17 | * This program is distributed in the hope that it will |
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18 | * be useful, but WITHOUT ANY WARRANTY; without even the |
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19 | * implied warranty of MERCHANTABILITY or FITNESS FOR A |
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20 | * PARTICULAR PURPOSE. See the GNU General Public License |
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21 | * for more details. |
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22 | |
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23 | Description: |
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24 | This class can generate CAPTCHAs, see README for more details! |
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25 | |
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26 | Get the "Hurry up!" Font for the Captcha and |
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27 | save it in the same directory as this file. |
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28 | |
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29 | "Hurry up!" Font (c) by Andi |
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30 | See http://www.1001fonts.com/font_details.html?font_id=2366 |
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31 | ******************************************************************/ |
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32 | |
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33 | class captcha |
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34 | { |
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35 | |
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36 | var $Length; |
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37 | var $CaptchaString; |
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38 | var $ImageType; |
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39 | var $Font; |
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40 | var $CharWidth; |
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41 | |
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42 | function captcha ($length = 5, $type = 'png') |
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43 | { |
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44 | $this->Length = $length; |
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45 | $this->ImageType = $type; |
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46 | $this->Font = './hurryup.ttf'; |
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47 | $this->CharWidth = 27; |
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48 | $this->StringGen(); |
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49 | } |
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50 | |
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51 | function Showcaptcha() |
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52 | { |
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53 | $this->SendHeader(); |
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54 | $this->MakeCaptcha(); |
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55 | } |
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56 | |
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57 | function StringGen () |
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58 | { |
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59 | $uppercase = range('A', 'Z'); |
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60 | $numeric = range(0, 9); |
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61 | $CharPool = array_merge($uppercase, $numeric); |
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62 | $PoolLength = count($CharPool) - 1; |
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63 | for ($i = 0; $i < $this->Length; ++$i) |
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64 | { |
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65 | $this->CaptchaString .= $CharPool[mt_rand(0, $PoolLength)]; |
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66 | } |
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67 | } |
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68 | |
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69 | function SendHeader () |
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70 | { |
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71 | switch ($this->ImageType) |
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72 | { |
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73 | case 'jpeg': header('Content-type: image/jpeg'); break; |
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74 | case 'png': header('Content-type: image/png'); break; |
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75 | default: header('Content-type: image/png'); break; |
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76 | } |
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77 | } |
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78 | |
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79 | function MakeCaptcha () |
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80 | { |
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81 | $imagelength = $this->Length * $this->CharWidth + 16; |
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82 | $imageheight = 37; |
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83 | $image = imagecreate($imagelength, $imageheight); |
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84 | $bgcolor = imagecolorallocate($image, 146, 176, 212); |
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85 | $stringcolor = imagecolorallocate($image, 0, rand(0,100), rand(0,155)); |
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86 | $linecolor = imagecolorallocate($image, 0, 0, 0); |
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87 | imagettftext($image, 20, rand(-4,4),8,30, |
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88 | $stringcolor, |
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89 | $this->Font, |
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90 | $this->CaptchaString); |
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91 | imagecolortransparent($image,$bgcolor); |
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92 | |
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93 | function hex2int($image, $color) { |
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94 | $string = str_replace("#","",$color); |
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95 | $red = hexdec(substr($string,0,2)); |
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96 | $green = hexdec(substr($string,2,2)); |
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97 | $blue = hexdec(substr($string,4,2)); |
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98 | |
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99 | $color_int = imagecolorallocate($image, $red, $green, $blue); |
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100 | return($color_int); |
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101 | } |
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102 | // create a blank image |
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103 | $src = imagecreatetruecolor(151, 37); |
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104 | |
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105 | // fill the background color |
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106 | imagefill($src, 0, 0, hex2int($src, "FFFFFF") ); |
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107 | |
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108 | |
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109 | /* Put some elipses */ |
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110 | for ($i=0; $i < 5; ++$i) |
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111 | { |
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112 | $col_ellipse = imagecolorallocate($src, rand (60,255), rand(60,255), rand(60, 255)); |
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113 | imagefilledellipse($src, rand(1,150), rand(1,50), rand(10,30), rand(10,30), $col_ellipse); |
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114 | } |
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115 | |
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116 | /* Put some vertical lines*/ |
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117 | for ($i=0; $i < 5; ++$i) |
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118 | { |
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119 | $xr = rand(0,130); |
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120 | $yr = rand(0,40); |
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121 | imagefilledrectangle($src, $xr, $yr, $xr+100, $yr+1, rand(0,255)); |
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122 | } |
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123 | |
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124 | /*Put some horizontal lines*/ |
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125 | for ($i=0; $i < 5; ++$i) |
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126 | { |
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127 | $xr = rand(0,130); |
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128 | $yr = rand(0,40); |
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129 | imagefilledrectangle($src, $xr, $yr, $xr+1, $yr+100, rand(0,255)); |
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130 | } |
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131 | |
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132 | imagecopymerge($image, $src, 0, 0, 0, 0, 151, 37, 25); |
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133 | |
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134 | switch ($this->ImageType) |
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135 | { |
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136 | case 'jpeg': imagejpeg($image); break; |
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137 | case 'png': imagepng($image); break; |
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138 | default: imagepng($image); break; |
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139 | } |
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140 | } |
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141 | |
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142 | function GetCaptchaString () |
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143 | { |
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144 | return $this->CaptchaString; |
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145 | } |
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146 | |
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147 | } |
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148 | |
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149 | // ************ Fim da Classe ************************* |
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150 | //Cria o CAPTCHA, gera o string e a imagem ... |
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151 | $GLOBALS['captcha'] = new captcha; |
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152 | // Guarda o string do captcha na session... |
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153 | session_name('sessionid'); |
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154 | session_start(); |
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155 | $_SESSION['CAPTCHAString'] = $GLOBALS['captcha'] ->GetCaptchaString(); |
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156 | // Vai exibir a imagem do captcha... |
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157 | $GLOBALS['captcha'] ->Showcaptcha(); |
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158 | ?> |
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