很实用的一个php验证码类

一个比较实用的php图形验证码生成类，调用方法也很简单的，有需要的朋友可以参考一下。

代码如下

复制代码

class ImageCode{ private $width;//验证码图片宽度 private $height;//验证码图片高度 private $codeNum;//验证码字符个数 private $checkCode;//验证码字符 private $image;//验证码画布 function __construct($width=60,$height=20,$codeNum=4){ $this->width=$width; $this->height=$height; $this->codeNum=$codeNum; $this->checkCode=$this->createCheckCode(); } function getcreateImage(){ $this->getcreateImage(); $this->outputText(); $this->setDisturbColor(); $this->outputImage(); } function getCheckCode(){ return $this->checkCode; } private function getCreateImage(){ $this->image=imagecreatetruecolor($this->width,$this->height); $black=imagecolorallocate($this->image,255,255,255,0); $border=imagecolorallocate($this->image,255,255,255,255); imagefilledrectangle($this->image,0,0,$this->width-1,$this->height-1,$border); } private function createCheckCode(){ for($i=0;$icodeNum;$i){ $number=rand(0,2); switch($number){ case 0: $rand_number=rand(48,57);//数字 break; case 1: $rand_number=rand(65,90);//大写字母 break; case 2: $rand_number=rand(97,122); break; } $asc=sprintf("%c",$rand_number); $asc_number=$asc_number.$asc; } return $asc_number; } private function setDisturbColor(){ for($i=0;$i $color=imagecolorallocate($this->image,255,255,255); imagesetpixel($this->image,rand(1,$this->width-2),rand(1,$this->height-2),$color); } } private function outputImage(){ if(imagetypes()&IMG_GIF){ header("Content_type:image/gif"); imagegif($this->image); }elseif(imagetypes()&IMG_JGP){ header("Content_type:image/jpeg"); imagejpeg($this->image,"",0.5); }else{ die("PHP不支持图像创建"); } } function __destruct(){ imagedestroy($this->image); } } ?>