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, 0, 155);
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86 | $linecolor = imagecolorallocate($image, 0, 0, 0);
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87 | imagettftext($image, 25, -4, 8, 25,
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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,$bgcolor);
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92 | switch ($this->ImageType)
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93 | {
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94 | case 'jpeg': imagejpeg($image); break;
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95 | case 'png': imagepng($image); break;
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96 | default: imagepng($image); break;
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97 | }
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98 | }
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99 |
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100 | function GetCaptchaString ()
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101 | {
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102 | return $this->CaptchaString;
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103 | }
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104 |
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105 | }
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106 |
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107 | // ************ Fim da Classe *************************
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108 |
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109 |
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110 | //Cria o CAPTCHA( gera o string e a imagem ...
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111 | $GLOBALS['captcha'] = new captcha;
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112 | // Guarda o string do captcha na session...
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113 | $_SESSION['CAPTCHAString'] = $GLOBALS['captcha'] ->GetCaptchaString();
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114 | // Vai exibir a imagem do captcha...
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115 | $GLOBALS['captcha'] ->Showcaptcha();
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116 | ?>
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