<?php
|
|
/**
|
验证码图片类
|
* ============================================================================
|
*
|
|
* ----------------------------------------------------------------------------
|
|
* ============================================================================
|
|
* $Id: cls_captcha.php 17217 2011-01-19 06:29:08Z $
|
*/
|
|
if (!defined('IN_ECS'))
|
{
|
die('Hacking attempt');
|
}
|
|
class captcha
|
{
|
/**
|
* 背景图片所在目录
|
*
|
* @var string $folder
|
*/
|
var $folder = 'data/captcha';
|
|
/**
|
* 图片的文件类型
|
*
|
* @var string $img_type
|
*/
|
var $img_type = 'png';
|
|
/*------------------------------------------------------ */
|
//-- 存在session中的名称
|
/*------------------------------------------------------ */
|
var $session_word = 'captcha_word';
|
|
/**
|
* 背景图片以及背景颜色
|
*
|
* 0 => 背景图片的文件名
|
* 1 => Red, 2 => Green, 3 => Blue
|
* @var array $themes
|
*/
|
var $themes_jpg = array(
|
1 => array('captcha_bg1.jpg', 255, 255, 255),
|
2 => array('captcha_bg2.jpg', 0, 0, 0),
|
3 => array('captcha_bg3.jpg', 0, 0, 0),
|
4 => array('captcha_bg4.jpg', 255, 255, 255),
|
5 => array('captcha_bg5.jpg', 255, 255, 255),
|
);
|
|
var $themes_gif = array(
|
1 => array('captcha_bg1.gif', 255, 255, 255),
|
2 => array('captcha_bg2.gif', 0, 0, 0),
|
3 => array('captcha_bg3.gif', 0, 0, 0),
|
4 => array('captcha_bg4.gif', 255, 255, 255),
|
5 => array('captcha_bg5.gif', 255, 255, 255),
|
);
|
|
/**
|
* 图片的宽度
|
*
|
* @var integer $width
|
*/
|
var $width = 130;
|
|
/**
|
* 图片的高度
|
*
|
* @var integer $height
|
*/
|
var $height = 20;
|
|
|
/* 代码修改_start By */
|
|
/**
|
* 构造函数
|
*
|
* @access public
|
* @param
|
*
|
* @return void
|
*/
|
function __construct($folder = '', $width = 145, $height = 20)
|
{
|
$this->captcha($folder, $width, $height);
|
}
|
|
/**
|
* 构造函数
|
*
|
* @access public
|
* @param string $folder 背景图片所在目录
|
* @param integer $width 图片宽度
|
* @param integer $height 图片高度
|
* @return bool
|
*/
|
function captcha($folder = '', $width = 145, $height = 20)
|
{
|
if (!empty($folder))
|
{
|
$this->folder = $folder;
|
}
|
|
$this->width = $width;
|
$this->height = $height;
|
|
/* 检查是否支持 GD */
|
if (PHP_VERSION >= '4.3')
|
{
|
|
return (function_exists('imagecreatetruecolor') || function_exists('imagecreate'));
|
}
|
else
|
{
|
|
return (((imagetypes() & IMG_GIF) > 0) || ((imagetypes() & IMG_JPG)) > 0 );
|
}
|
}
|
|
/* 代码修改_end By */
|
|
|
/**
|
* 检查给出的验证码是否和session中的一致
|
*
|
* @access public
|
* @param string $word 验证码
|
* @return bool
|
*/
|
function check_word($word)
|
{
|
$recorded = isset($_SESSION[$this->session_word]) ? base64_decode($_SESSION[$this->session_word]) : '';
|
$given = $this->encrypts_word(strtoupper($word));
|
return (preg_match("/$given/", $recorded));
|
}
|
|
/**
|
* 生成图片并输出到浏览器
|
*
|
* @access public
|
* @param string $word 验证码
|
* @return mix
|
*/
|
function generate_image($word = false)
|
{
|
if (!$word)
|
{
|
$word = $this->generate_word();
|
}
|
|
/* 记录验证码到session */
|
$this->record_word($word);
|
|
/* 验证码长度 */
|
$letters = strlen($word);
|
|
/* 选择一个随机的方案 */
|
mt_srand((double) microtime() * 1000000);
|
|
if (function_exists('imagecreatefromjpeg') && ((imagetypes() & IMG_JPG) > 0))
|
{
|
$theme = $this->themes_jpg[mt_rand(1, count($this->themes_jpg))];
|
}
|
else
|
{
|
$theme = $this->themes_gif[mt_rand(1, count($this->themes_gif))];
|
}
|
|
if (!file_exists($this->folder . $theme[0]))
|
{
|
return false;
|
}
|
else
|
{
|
$img_bg = (function_exists('imagecreatefromjpeg') && ((imagetypes() & IMG_JPG) > 0)) ?
|
imagecreatefromjpeg($this->folder . $theme[0]) : imagecreatefromgif($this->folder . $theme[0]);
|
$bg_width = imagesx($img_bg);
|
$bg_height = imagesy($img_bg);
|
|
$img_org = ((function_exists('imagecreatetruecolor')) && PHP_VERSION >= '4.3') ?
|
imagecreatetruecolor($this->width, $this->height) : imagecreate($this->width, $this->height);
|
|
/* 将背景图象复制原始图象并调整大小 */
|
if (function_exists('imagecopyresampled') && PHP_VERSION >= '4.3') // GD 2.x
|
{
|
imagecopyresampled($img_org, $img_bg, 0, 0, 0, 0, $this->width, $this->height, $bg_width, $bg_height);
|
}
|
else // GD 1.x
|
{
|
imagecopyresized($img_org, $img_bg, 0, 0, 0, 0, $this->width, $this->height, $bg_width, $bg_height);
|
}
|
imagedestroy($img_bg);
|
|
$clr = imagecolorallocate($img_org, $theme[1], $theme[2], $theme[3]);
|
|
/* 绘制边框 */
|
//imagerectangle($img_org, 0, 0, $this->width - 1, $this->height - 1, $clr);
|
|
/* 获得验证码的高度和宽度 */
|
$x = ($this->width - (imagefontwidth(5) * $letters)) / 2;
|
$y = ($this->height - imagefontheight(5)) / 2;
|
imagestring($img_org, 5, $x, $y, $word, $clr);
|
|
header('Expires: Thu, 01 Jan 1970 00:00:00 GMT');
|
|
// HTTP/1.1
|
header('Cache-Control: private, no-store, no-cache, must-revalidate');
|
header('Cache-Control: post-check=0, pre-check=0, max-age=0', false);
|
|
// HTTP/1.0
|
header('Pragma: no-cache');
|
if ($this->img_type == 'jpeg' && function_exists('imagecreatefromjpeg'))
|
{
|
header('Content-type: image/jpeg');
|
imageinterlace($img_org, 1);
|
imagejpeg($img_org, false, 95);
|
}
|
else
|
{
|
header('Content-type: image/png');
|
imagepng($img_org);
|
}
|
|
imagedestroy($img_org);
|
|
return true;
|
}
|
}
|
|
/*------------------------------------------------------ */
|
//-- PRIVATE METHODs
|
/*------------------------------------------------------ */
|
|
/**
|
* 对需要记录的串进行加密
|
*
|
* @access private
|
* @param string $word 原始字符串
|
* @return string
|
*/
|
function encrypts_word($word)
|
{
|
return substr(md5($word), 1, 10);
|
}
|
|
/**
|
* 将验证码保存到session
|
*
|
* @access private
|
* @param string $word 原始字符串
|
* @return void
|
*/
|
function record_word($word)
|
{
|
$_SESSION[$this->session_word] = base64_encode($this->encrypts_word($word));
|
}
|
|
/**
|
* 生成随机的验证码
|
*
|
* @access private
|
* @param integer $length 验证码长度
|
* @return string
|
*/
|
function generate_word($length = 4)
|
{
|
$chars = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ';
|
|
for ($i = 0, $count = strlen($chars); $i < $count; $i++)
|
{
|
$arr[$i] = $chars[$i];
|
}
|
|
mt_srand((double) microtime() * 1000000);
|
shuffle($arr);
|
|
return substr(implode('', $arr), 5, $length);
|
}
|
}
|
|
?>
|
