<?php

/**
* 生成图像验证码
*
* 代码来自 ThinkPHP 的 Lib/ORG/Util/Image.class.php 文件，特此对 ThinkPHP 团队表示感谢 :)
*
* Custom
*
* LICENSE:
*
* @category   Custom
* @package    Custom
* @subpackage Controller
* @copyright Copyright (c) KenJi
* @license   
* @version   
*/

/**
* Zend_Controller_Plugin_Abstract
*/
//require_once    'Zend/Controller/Plugin/Abstract.php';
//require_once 'Zend/Session/Namespace.php';

class Custom_Controller_Plugin_ImgCode extends Zend_Controller_Plugin_Abstract
{
    
    /**
     +----------------------------------------------------------
     * 生成图像验证码
     +----------------------------------------------------------
     * @static
     * @access public
     +----------------------------------------------------------
     * @param string $length 位数
     * @param string $mode 类型 0 字母 1:数字，2：大写字母 3:小写字母 4:以上混合形式
     * @param string $type 图像格式
     * @param string $width 宽度
     * @param string $height 高度
     +----------------------------------------------------------
     * @return string
     +----------------------------------------------------------
     * @throws ThinkExecption
     +----------------------------------------------------------
     */
    function image2($length=4,$mode=4,$type='png',$width=50,$height=25)
    {
        $randval = $this->rand_string($length,$mode);//生成随机数
		
		
        //$authCode = new Zend_Session_Namespace('Auth_Code');
        //$authCode->imagecode = $randval;//生成session
       
        $_SESSION['vdcodes'] = strtolower($randval);
       
        $width = ($length*9+10)>$width?$length*9+10:$width;
        if ( $type!='gif' && function_exists('imagecreatetruecolor')) {
            $im = @imagecreatetruecolor($width,$height);
        }else {
            $im = @imagecreate($width,$height);
        }
        $r = Array(225,255,255,223);
        $g = Array(225,236,237,255);
        $b = Array(225,236,166,125);
        $key = mt_rand(0,3);

        $backColor = imagecolorallocate($im, $r[$key],$g[$key],$b[$key]);    //背景色（随机）
        $borderColor = imagecolorallocate($im, 100, 100, 100);                    //边框色
        $pointColor = imagecolorallocate($im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));                 //点颜色

        @imagefilledrectangle($im, 0, 0, $width - 1, $height - 1, $backColor);
        @imagerectangle($im, 0, 0, $width-1, $height-1, $borderColor);
        $stringColor = imagecolorallocate($im,mt_rand(0,200),mt_rand(0,120),mt_rand(0,120));
        // 干扰
        for($i=0;$i<10;$i++){
            $fontcolor=imagecolorallocate($im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
            imagearc($im,mt_rand(-10,$width),mt_rand(-10,$height),mt_rand(30,300),mt_rand(20,200),55,44,$fontcolor);
        }
        for($i=0;$i<25;$i++){
            $fontcolor=imagecolorallocate($im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
            imagesetpixel($im,mt_rand(0,$width),mt_rand(0,$height),$pointColor);
        }

        @imagestring($im, 5, 5, 3, $randval, $stringColor);
        $this->output($im,$type);
    }

    // 更复杂的验证码
    function image3($length=4,$type='png',$width=50,$height=60,$fontface='fpnf.ttf',$verifyName='verify') {
        $code    =    $this->rand_string($length,4);
        $width = ($length*25)>$width?$length*25:$width;
        $authCode = new Zend_Session_Namespace('Auth_Code');
        $authCode->imagecode = $randval;
       
        $im=imagecreatetruecolor($width,$height);
        $borderColor = imagecolorallocate($im, 100, 100, 100);                    //边框色
        $bkcolor=imagecolorallocate($im,250,250,250);
        imagefill($im,0,0,$bkcolor);
        @imagerectangle($im, 0, 0, $width-1, $height-1, $borderColor);
        // 干扰
        for($i=0;$i<15;$i++){
            $fontcolor=imagecolorallocate($im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
            imagearc($im,mt_rand(-10,$width),mt_rand(-10,$height),mt_rand(30,300),mt_rand(20,200),55,44,$fontcolor);
        }
        for($i=0;$i<255;$i++){
            $fontcolor=imagecolorallocate($im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
            imagesetpixel($im,mt_rand(0,$width),mt_rand(0,$height),$fontcolor);
        }
        if(!is_file($fontface)) {
            $fontface = dirname(__FILE__)."/".$fontface;
        }
        for($i=0;$i<$length;$i++){
            $fontcolor=imagecolorallocate($im,mt_rand(0,120),mt_rand(0,120),mt_rand(0,120)); //这样保证随机出来的颜色较深。
            $codex= substr($code,$i,1);
            imagettftext($im,mt_rand(16,20),mt_rand(-60,60),40*$i+20,mt_rand(30,35),$fontcolor,$fontface,$codex);
        }
        $this->output($im,$type);
    }
   
    function output($im,$type='png')
    {
        header("Content-type: image/".$type);
        $ImageFun='Image'.$type;
        $ImageFun($im);
        imagedestroy($im);    
    }   
   
    /**
     +----------------------------------------------------------
     * 产生随机字串，可用来自动生成密码 默认长度6位 字母和数字混合
     +----------------------------------------------------------
     * @param string $len 长度
     * @param string $type 字串类型
     * 0 字母 1 数字 其它 混合
     * @param string $addChars 额外字符
     +----------------------------------------------------------
     * @return string
     +----------------------------------------------------------
     */
    function rand_string($len=6,$type='',$addChars='') {
        $str ='';
        switch($type) {
            case 0:
                $chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.$addChars;
                break;
            case 1:
                $chars= str_repeat('0123456789',3);
                break;
            case 2:
                $chars='ABCDEFGHIJKLMNOPQRSTUVWXYZ'.$addChars;
                break;
            case 3:
                $chars='abcdefghijklmnopqrstuvwxyz'.$addChars;
                break;
            default :
                // 默认去掉了容易混淆的字符oOLl和数字01，要添加请使用addChars参数
                $chars='ABCDEFGHIJKMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz23456789'.$addChars;
                break;
        }
        if($len>10 ) {//位数过长重复字符串一定次数
            $chars= $type==1? str_repeat($chars,$len) : str_repeat($chars,5);
        }
        if($type!=4) {
            $chars   =   str_shuffle($chars);
            $str     =   substr($chars,0,$len);
        }else{
            // 中文随机字
            for($i=0;$i<$len;$i++){  
            $str.= substr($chars, floor(mt_rand(0,mb_strlen($chars,'utf-8')-1)),1);  
            }
        }
        return $str;
    }
   
}