PHP雪花背景验证码

ValidateCode.class.php

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<?php     /**      * 验证码类      * @author staven      *      */     class ValidateCode{                   private $width;         //验证码图片的宽度         private $height;        //验证码图片的高度         private $checkCode;     //验证码字符         private $codeNum;       //验证码字符个数         private $font;          //字体         private $fontSize;      //字体大小         private $fontColor;     //字体颜色         private $image;         //验证码句柄         private $charset;       //验证字符随机因子                   //构造器方法初始化         function __construct($width=100, $height=20, $codeNum=4,$fontSize = 12){             $this->width = $width;             $this->height = $height;             $this->codeNum = $codeNum;             $this->fontSize = $fontSize;             $this->font = dirname(__FILE__) . '/font/elephant.ttf';             $this->charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';      //提供随机因子             $this->checkCode = $this->createCheckCode();                       }                   /* 用于输出验证码图片，并且将验证码信息写入session */         function __toString(){             /* 加到session中， 存储下标为code */             $_SESSION["code"] = strtoupper($this->checkCode);             $this->outImage();             return '';         }                   /* 生成随机验证码字符 */         private function createCheckCode(){                           for ($i=0; $i<$this->codeNum; $i++){                 $this->checkCode .= $this->charset{mt_rand(0,strlen($this->charset)-1)};             }             return $this->checkCode;         }                   /* 输出验证码 */         private function outImage(){             $this->getCreateImage();             $this->createLine();             $this->outputText();             $this->outputImage();         }                    /* 生成验证码背景图片 */         private function getCreateImage(){             $this->image = imagecreatetruecolor($this->width,$this->height);             $color = imagecolorallocate($this->image, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));             imagefilledrectangle($this->image,0,$this->height,$this->width,0,$color);          }                   /* 向句柄图片中写入文字信息 */         private function outputText(){             $_x = $this->width / $this->codeNum;              for ($i=0;$i<$this->codeNum;$i++) {                  $this->fontcolor = imagecolorallocate($this->image,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));                  imagettftext($this->image,$this->fontSize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontColor,$this->font,$this->checkCode[$i]);              }          }                   /*  创建雪花图案 */         private function createLine() {             for ($i=0;$i<6;$i++) {                 $color = imagecolorallocate($this->image,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));                 imageline($this->image,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color);             }             for ($i=0;$i<100;$i++) {                 $color = imagecolorallocate($this->image,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));                 imagestring($this->image,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);             }         }                   /* 生成验证码图片 */         private function outputImage(){             header('Content-type:image/png');              imagepng($this->image);                       }                   /* 销毁句柄，释放资源 */         function __destruct() {             imagedestroy($this->image);         }               }

imageCode.php

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<?php     session_start();        //开启SESSION     require_once 'ValidateCode.class.php';     echo new ValidateCode();

image.php

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<!DOCTYPE html> <html> <head>     <meta charset="gbk">     <title>验证码</title> </head> <body>     <img src="imagecode.php" alt="看不清楚，换一张" style="cursor: pointer;" onclick="this.src='imagecode.php?'+new Date().getTime();" />     <form method="POST" action="image.php">         <input type="text"  size="4" name="code" />         <input type="submit" name="submit" value="提交">     </form> </body> </html> <?php         /** 用于 */     session_start();                                                    //开启SESSION     if(isset($_POST['submit'])){                                        //判断用户提交后执行         /* 判断用户在表单中输入的字符串和验证码图片中的字符串是否相同  */         if(strtoupper(trim($_POST["code"])) == $_SESSION['code']){      //如果验证码输出成功             echo '验证码输入成功<br>';                                   //输出成功的提示信息         }else{                                                          //如果验证码输入失败             echo '<font color="red">验证码输入错误！！</font><br>';    //输出失败的输入信息         }     } ?>

 

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