<?php
require_once(dirname(__FILE__).DIRECTORY_SEPARATOR."..".DIRECTORY_SEPARATOR."..".DIRECTORY_SEPARATOR."..".DIRECTORY_SEPARATOR."..".DIRECTORY_SEPARATOR."wp-load.php");
/**
* 验证码
* Class Captcha
*/
class Captcha{
/**
* 验证码宽度
*
* @since 2.0.0
* @access private
* @var int
*/
private $_width ;
/**
* 验证码高度
*
* @since 2.0.0
* @access private
* @var int
*/
private $_height;
/**
* 验证码字符个数
*
* @since 2.0.0
* @access private
* @var int
*/
private $_counts;
/**
* 允许的字符范围
*
* @since 2.0.0
* @access private
* @var string
*/
private $_distrubcode;
/**
* 验证码字体
*
* @since 2.0.0
* @access private
* @var string
*/
private $_font;
/**
* Session
*
* @since 2.0.0
* @access private
* @var string
*/
private $_session;
function __construct($width = 120, $height = 30, $counts = 5, $distrubcode='', $font=''){
// Check for GD library
if( !function_exists('gd_info') ) {
throw new Exception('Required GD library is missing', 'tt');
}
$this->_width = $width;
$this->_height = $height;
$this->_counts = $counts;
$this->_distrubcode = empty($distrubcode) ? "1235467890qwertyuipkjhgfdaszxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM" : $distrubcode;
$this->_font = empty($font) ? THEME_DIR.DIRECTORY_SEPARATOR."fonts".DIRECTORY_SEPARATOR."consolas".DIRECTORY_SEPARATOR."consolas-webfont.ttf" : $font;
$this->_session = $this->sessioncode();
session_start();
$_SESSION['tin_captcha'] = $this->_session;
$this->imageout();
}
/**
* 产生随机的字符用于验证码
*
* @since 2.0.0
* @access private
* @return string
*/
private function sessioncode(){
$originalcode = $this->_distrubcode;
$countdistrub = strlen($originalcode);
$_dscode = "";
$counts=$this->_counts;
for($j=0; $j<$counts; $j++){
$dscode = $originalcode[rand(0, $countdistrub-1)];
$_dscode.=$dscode;
}
return $_dscode;
}
/**
* 创建画布资源
*
* @since 2.0.0
* @access private
* @return resource
*/
private function create_imagesource(){
return imagecreate($this->_width,$this->_height);
}
/**
* 设置背景色
*
* @since 2.0.0
* @access private
* @param resource $image 画布资源
* @return void
*/
private function set_backgroundcolor($image){
$bgcolor = imagecolorallocate($image, rand(200,255), rand(200,255), rand(200,255));
imagefill($image, 0, 0, $bgcolor);
}
/**
* 添加验证码字符
*
* @since 2.0.0
* @access private
* @param resource $image 画布资源
* @return void
*/
private function set_code(&$image){
$width=$this->_width;
$counts=$this->_counts;
$height=$this->_height;
$scode=$this->_session;
$y=floor($height/2) + floor($height/4);
$fontsize=rand(20,25);
$font=$this->_font;
for($i=0; $i<$counts; $i++){
$char=$scode[$i];
$x=floor($width/$counts)*$i+8;
$angle=rand(-20,30);
$color = imagecolorallocate($image, rand(0,50), rand(50,100), rand(100,140));
imagettftext($image, $fontsize, $angle, $x, $y, $color, $font, $char);
}
}
/**
* 添加验证码干扰字符
*
* @since 2.0.0
* @access private
* @param resource $image 画布资源
* @return void
*/
private function set_distrubecode(&$image){
$count_h=$this->_height;
$cou=floor($count_h*2);
for($i=0; $i<$cou; $i++){
$x=rand(0,$this->_width);
$y=rand(0,$this->_height);
$angle=rand(0,360);
$fontsize=rand(4,6);
$font=$this->_font;
$originalcode = $this->_distrubcode;
$countdistrub = strlen($originalcode);
$dscode = $originalcode[rand(0, $countdistrub-1)];
$color = imagecolorallocate($image, rand(40,140), rand(40,140), rand(40,140));
imagettftext($image, $fontsize, $angle, $x, $y, $color, $font, $dscode);
}
}
/**
* 输出图像
*
* @since 2.0.0
* @access private
* @return void
*/
private function imageout(){
$im = $this->create_imagesource();
$this->set_backgroundcolor($im);
$this->set_code($im);
$this->set_distrubecode($im);
header("Content-Type: image/png");
imagepng($im);
imagedestroy($im);
}
}
$captcha = new Captcha(90, 40, 4);