1 <?php 2  3 #引入验证码类文件 4 require_once(‘Verify.class.php‘); 5  6 #实例化验证码类 7 #初始化的使用可以传四个参数，分别是：验证码图片的长、高，验证码的长度，验证码的类型（验证码的类型需要将bgRand属性设置为false） 8 $code = new Verify(140, 40, 6, 6); 9 10 #设置验证码图片的长度11 $code -> width = 200;12 13 #设置验证码图片的高度14 $code -> height = 60;15 16 #是否随机背景，默认true（随机）17 $code -> bgRand = false;18 19 #显示验证码20 $code -> verify();

  1 <?php  2   3 /**  4  * 验证码类  5  * @author John <fsyzxz@163.com>  6  */  7 class Verify  8 {  9     private $width = 160;       //验证码的宽度 10     private $height = 60;       //验证码的高度 11     private $type = 1;          //验证码的类型 12     private $length = 4;        //验证码的长度 13     private $code;              //验证码 14     private $img;               //图像的资源 15     private $seKey = ‘John‘;    //密钥 16     private $bgRand = true;     //随机背景图片 17      18     /** 19      * 构造函数 20      * @param type $width 验证码的宽度 21      * @param type $height 验证码的高度 22      * @param type $length 验证码的长度 23      * @param type $type 验证码的类型 24      */ 25     public function __construct($width = 160, $height = 40, $length = 4, $type = 1) 26     { 27         $this->width  = !empty($width)  ? $width  : $this->width; 28         $this->height = !empty($height) ? $height : $this->height; 29         $this->length = !empty($length) ? $length : $this->length; 30         $this->type   = !empty($type)   ? $type   : $this->type; 31     } 32      33     /** 34      * 设置属性值 35      * @param type $name 属性名 36      * @param type $value 属性值 37      */ 38     public function __set($name, $value) 39     { 40         if (isset($name)) { 41             $this->$name = $value; 42         } 43     } 44      45     /** 46      * 获取属性值 47      * @param type $name 属性名 48      * @return type 返回属性值 49      */ 50     public function __get($name) { 51         return $this->$name; 52     } 53      54     /** 55      * 校验验证码 56      * @param type $code 表单提供的验证码 57      * @return boolean 58      */ 59     public function check($code){ 60         if (!isset($_SESSION)) {session_start();} 61         if ($this->encodeVerify(strtolower($code)) === $_SESSION[‘code‘]){ 62             return true; 63         }else{ 64             return false; 65         } 66     } 67      68     //输出验证码 69     public function verify() 70     { 71         $this->code = $this->createVerify(); 72         //创建背景 73         $this->createBackground(); 74         //文字显示 75         $this->writeString(); 76         //画干扰线 77         $this->paitLine(); 78         //输入图像 79         $this->printImg(); 80     } 81      82     /** 83      * 创建背景图片 84      */ 85     private function createBackground() 86     { 87         //从图片库创建一个图像, 判断是否随机 88         if ($this->bgRand){ 89             $img = imagecreatefromjpeg(‘./verify/bgs/‘.mt_rand(1,8).‘.jpg‘); 90         }else{ 91             $img = imagecreatefromjpeg(‘./verify/bgs/‘.$this->type.‘.jpg‘); 92         } 93         //创建一个图片 94         $this->img = imagecreatetruecolor($this->width, $this->height); 95         //把图片复制到创建的图像上 96         imagecopyresampled($this->img, $img, 0, 0, 0, 0, $this->width, $this->height, imagesx($img), imagesy($img)); 97     } 98      99     /**100      * 在图片上写字101      */102     private function writeString()103     {104         $color = imagecolorallocatealpha($this->img, mt_rand(0,128), mt_rand(0,128), mt_rand(0,128), 0);105         $fontType = ‘./verify/ttfs/‘.mt_rand(1,6).‘.ttf‘;106         $fontSize = mt_rand(15, 20);107         for ($i = 0; $i < $this->length; $i++) {108             $x = 3+($this->width/$this->length)*$i;109             $y = mt_rand(($this->height/3)*2, ($this->height/3)*2);110             //把验证码写在图片上111             imagettftext($this->img, $fontSize, 0, $x, $y, $color, $fontType, $this->code[$i]);112         }113     }114     115     /**116      * 画干扰线和字母117      */118     private function paitLine()119     {120         $px = $py = 0;121         $codes = ‘2345678abcdefhijkmnpqrstuvwxyz‘;122         for ($i = 0; $i < $this->width/4; $i++){123             $num = mt_rand(0, strlen($codes)-1);124             $color = imagecolorallocatealpha($this->img, 255, 255, 255, 80);125             //画字母126             imagechar($this->img, 8, mt_rand(3, $this->width), mt_rand(3, $this->height), $codes{$num}, $color);127         }128     }129     130     /**131      * 输入图像132      */133     private function printImg()134     {135         if(function_exists(‘imagegif‘)){136             // 针对 GIF137             header(‘Content-Type: image/gif‘);138             imagegif($this->img);139         }elseif(function_exists(‘imagejpeg‘)){140             // 针对 JPEG141             header(‘Content-Type: image/jpeg‘);142             imagejpeg($this->img, NULL, 100);143         }elseif(function_exists(‘imagepng‘)){144             // 针对 PNG145             header(‘Content-Type: image/png‘);146             imagepng($this->img);147         }elseif(function_exists(‘imagewbmp‘)){148             // 针对 WBMP149             header(‘Content-Type: image/vnd.wap.wbmp‘);150             imagewbmp($this->img);151         }152     }153     154     /**155      * 生成验证码156      * @return string 返回生成的验证码157      */158     private function createVerify()159     {160         $codeSet = ‘2345678abcdefhijkmnpqrstuvwxyz‘;161         $codes = ‘‘;162         for ($i = 0; $i < $this->length; $i++) {163             $codes .= $codeSet[mt_rand(0, strlen($codeSet)-1)];164         }165         //把验证码保存到session中166         if (!isset($_SESSION)) {session_start();}167         $_SESSION[‘code‘] = $this->encodeVerify(strtolower($codes));168 //        $_SESSION[‘code‘] = $codes;169         return $codes;170     }171     172     /**173      * 加密验证码174      * @param type $string175      * @return type176      */177     private function encodeVerify($string)178     {179         $key = substr(md5($this->seKey), 5, 8);180         $str = substr(md5($string), 8, 10);181         return md5($key . $str);182     }183     184     /**185      * 销毁图像186      */187     function __destruct()188     {189         if (isset($this->img)){190             imagedestroy($this->img);191         }192     }193 }

if ($code -> code(这是传入你页面中获取的验证码值)){    #这是验证正确的操作}else{    #验证失败的操作}