[1174] | 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 | $this->CaptchaString);
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[1574] | 91 | imagecolortransparent($image,$bgcolor);
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[1174] | 92 | switch ($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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