322 lines
9.0 KiB
PHP
Executable File
322 lines
9.0 KiB
PHP
Executable File
<?php
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/**
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* 驗證碼
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*/
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if (!defined('IN_ECS'))
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{
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die('Hacking attempt');
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}
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class captcha
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{
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/**
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* 背景图片所在目录
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*
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* @var string $folder
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*/
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var $folder = 'data/captcha';
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/**
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* 图片的文件类型
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*
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* @var string $img_type
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*/
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var $img_type = 'png';
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/*------------------------------------------------------ */
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//-- 存在session中的名称
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/*------------------------------------------------------ */
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var $session_word = 'captcha_word';
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/**
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* 背景图片以及背景颜色
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*
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* 0 => 背景图片的文件名
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* 1 => Red, 2 => Green, 3 => Blue
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* @var array $themes
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*/
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var $themes_jpg = array(
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1 => array('captcha_bg6.jpg', 16, 138, 205),
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2 => array('captcha_bg6.jpg', 46, 46, 46),
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3 => array('captcha_bg6.jpg', 176, 46, 56),
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4 => array('captcha_bg6.jpg', 18, 18, 18),
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5 => array('captcha_bg6.jpg', 248, 3, 0),
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// 2 => array('captcha_bg2.jpg', 0, 0, 0),
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// 3 => array('captcha_bg3.jpg', 0, 0, 0),
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// 4 => array('captcha_bg4.jpg', 255, 255, 255),
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// 5 => array('captcha_bg5.jpg', 255, 255, 255),
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);
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var $themes_gif = array(
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// 1 => array('captcha_bg1.gif', 255, 255, 255),
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// 2 => array('captcha_bg2.gif', 0, 0, 0),
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// 3 => array('captcha_bg3.gif', 0, 0, 0),
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// 4 => array('captcha_bg4.gif', 255, 255, 255),
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// 5 => array('captcha_bg5.gif', 255, 255, 255),
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1 => array('captcha_bg6.gif', 16, 138, 205),
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2 => array('captcha_bg6.gif', 46, 46, 46),
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3 => array('captcha_bg6.gif', 176, 46, 56),
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4 => array('captcha_bg6.gif', 18, 18, 18),
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5 => array('captcha_bg6.gif', 248, 3, 0),
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);
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/**
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* 图片的宽度
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*
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* @var integer $width
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*/
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var $width = 100;
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/**
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* 图片的高度
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*
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* @var integer $height
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*/
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var $height = 20;
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/* 代码修改_start By www.68ecshop.com */
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/**
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* 构造函数
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*
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* @access public
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* @param
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*
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* @return void
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*/
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function __construct($folder = '', $width = 100, $height = 33)
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{
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$this->captcha($folder, $width, $height);
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}
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/**
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* 构造函数
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*
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* @access public
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* @param string $folder 背景图片所在目录
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* @param integer $width 图片宽度
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* @param integer $height 图片高度
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* @return bool
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*/
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function captcha($folder = '', $width = 145, $height = 20)
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{
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if (!empty($folder))
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{
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$this->folder = $folder;
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}
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$this->width = $width;
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$this->height = $height;
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/* 检查是否支持 GD */
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if (PHP_VERSION >= '4.3')
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{
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return (function_exists('imagecreatetruecolor') || function_exists('imagecreate'));
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}
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else
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{
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return (((imagetypes() & IMG_GIF) > 0) || ((imagetypes() & IMG_JPG)) > 0 );
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}
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}
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/**
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* 检查给出的验证码是否和session中的一致
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*/
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function check_word($word, $clear = false)
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{
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$recorded = isset($_SESSION[$this->session_word]) ? base64_decode($_SESSION[$this->session_word]) : '';
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$given = $this->encrypts_word(strtoupper($word));
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if($clear)
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{
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$this->clear_captcha();
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}
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return (preg_match("/$given/", $recorded));
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}
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/**
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* 清空验证码，使当前验证码失效
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*/
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function clear_captcha(){
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if($_SESSION[$this->session_word])
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{
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unset($_SESSION[$this->session_word]);
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}
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}
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/**
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* 生成图片并输出到浏览器
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*
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* @access public
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* @param string $word 验证码
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* @return mix
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*/
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function generate_image($word = false)
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{
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if (!$word)
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{
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$word = $this->generate_word();
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}
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/* 记录验证码到session */
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$this->record_word($word);
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/* 验证码长度 */
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$letters = strlen($word);
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/* 选择一个随机的方案 */
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mt_srand((double) microtime() * 1000000);
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if (function_exists('imagecreatefromjpeg') && ((imagetypes() & IMG_JPG) > 0))
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{
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$theme = $this->themes_jpg[mt_rand(1, count($this->themes_jpg))];
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}
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else
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{
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$theme = $this->themes_gif[mt_rand(1, count($this->themes_gif))];
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}
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if (!file_exists($this->folder . $theme[0]))
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{
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return false;
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}
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else
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{
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$img_bg = (function_exists('imagecreatefromjpeg') && ((imagetypes() & IMG_JPG) > 0)) ?
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imagecreatefromjpeg($this->folder . $theme[0]) : imagecreatefromgif($this->folder . $theme[0]);
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$bg_width = imagesx($img_bg);
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$bg_height = imagesy($img_bg);
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$img_org = ((function_exists('imagecreatetruecolor')) && PHP_VERSION >= '4.3') ?
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imagecreatetruecolor($this->width, $this->height) : imagecreate($this->width, $this->height);
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/* 将背景图象复制原始图象并调整大小 */
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if (function_exists('imagecopyresampled') && PHP_VERSION >= '4.3') // GD 2.x
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{
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imagecopyresampled($img_org, $img_bg, 0, 0, 0, 0, $this->width, $this->height, $bg_width, $bg_height);
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}
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else // GD 1.x
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{
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imagecopyresized($img_org, $img_bg, 0, 0, 0, 0, $this->width, $this->height, $bg_width, $bg_height);
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}
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imagedestroy($img_bg);
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//$clr = imagecolorallocate($img_org, $theme[1], $theme[2], $theme[3]);
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$clr = imagecolorallocate($img_org, 0, 0, 0);
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/* 绘制边框 */
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//imagerectangle($img_org, 0, 0, $this->width - 1, $this->height - 1, $clr);
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/* 获得验证码的高度和宽度 */
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$x = ($this->width - (imagefontwidth(5) * $letters)) / 2;
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$y = ($this->height - imagefontheight(5)) / 2;
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//imagestring($img_org, 5, $x, $y, $word, $clr);
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//倾斜角度、X、Y位置
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$position = null;
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if(rand(0, 1) == 0)
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{
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$position = array('-'.rand(0, 10), 10, 20);
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}
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else
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{
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$position = array(rand(0, 10), 10, 23);
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}
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//字体
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$ttf_font = $this->folder.'/arial.ttf';
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if(function_exists('ImageTTFText'))
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{
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ImageTTFText($img_org, 14, $position[0], $position[1], $position[2], $clr, $ttf_font, $word);
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}
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else
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{
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imagestring($img_org, 14, $x, $y, $word, $clr);
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}
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header('Expires: Thu, 01 Jan 1970 00:00:00 GMT');
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// HTTP/1.1
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header('Cache-Control: private, no-store, no-cache, must-revalidate');
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header('Cache-Control: post-check=0, pre-check=0, max-age=0', false);
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// HTTP/1.0
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header('Pragma: no-cache');
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if ($this->img_type == 'jpeg' && function_exists('imagecreatefromjpeg'))
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{
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header('Content-type: image/jpeg');
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imageinterlace($img_org, 1);
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imagejpeg($img_org, false, 95);
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}
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else
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{
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header('Content-type: image/png');
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imagepng($img_org);
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}
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imagedestroy($img_org);
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return true;
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}
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}
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/*------------------------------------------------------ */
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//-- PRIVATE METHODs
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/*------------------------------------------------------ */
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/**
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* 对需要记录的串进行加密
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*
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* @access private
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* @param string $word 原始字符串
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* @return string
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*/
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function encrypts_word($word)
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{
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return substr(md5($word), 1, 10);
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}
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/**
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* 将验证码保存到session
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*
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* @access private
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* @param string $word 原始字符串
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* @return void
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*/
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function record_word($word)
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{
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$_SESSION[$this->session_word] = base64_encode($this->encrypts_word($word));
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}
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/**
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* 生成随机的验证码
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*
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* @access private
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* @param integer $length 验证码长度
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* @return string
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*/
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function generate_word($length = 4)
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{
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$chars = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ';
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for ($i = 0, $count = strlen($chars); $i < $count; $i++)
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{
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$arr[$i] = $chars[$i];
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}
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mt_srand((double) microtime() * 1000000);
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shuffle($arr);
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return substr(implode('', $arr), 5, $length);
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}
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}
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?>
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