封装一个验证码类validationcode.class.
php php
width=$width;$this->height=$height;$this->codeNum=$codeNum;$this->checkCode=$this->createCheckCode();$number=floor($width*$height/15);if($number > 240-$codeNum){$this->disturbColorNum= 240-$codeNum;}else{$this->disturbColorNum=$number;}}//通过访问该方法向浏览器中输出图像function showImage($fontFace=""){//第一步：创建图像背景$this->createImage();//第二步：设置干扰元素$this->setDisturbColor();//第三步：向图像中随机画出文本$this->outputText($fontFace);//第四步：输出图像$this->outputImage();}//通过调用该方法获取随机创建的验证码字符串function getCheckCode(){return $this->checkCode;}private function createImage(){//创建图像资源$this->image=imagecreatetruecolor($this->width, $this->height);//随机背景色$backColor=imagecolorallocate($this->image, rand(225, 255), rand(225,255), rand(225, 255));//为背景添充颜色imagefill($this->image, 0, 0, $backColor);//设置边框颜色$border=imagecolorallocate($this->image, 0, 0, 0);//画出矩形边框imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $border);}private function setDisturbColor(){for($i=0; $idisturbColorNum; $i++){$color=imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));imagesetpixel($this->image, rand(1, $this->width-2), rand(1, $this->height-2), $color);}for($i=0; $i$color=imagecolorallocate($this->image, rand(200, 255), rand(200, 255), rand(200, 255));imagearc($this->image, rand(-10, $this->width), rand(-10, $this->height), rand(30, 300), rand(20, 200), 55, 44, $color);}}private function createCheckCode(){$code="23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";$string='';for($i=0; $i codeNum; $i++){$char=$code{rand(0, strlen($code)-1)};$string.=$char;}return $string;}private function outputText($fontFace=""){for($i=0; $icodeNum; $i++){$fontcolor=imagecolorallocate($this->image, rand(0, 128), rand(0, 128), rand(0, 128));if($fontFace==""){$fontsize=rand(3, 5);$x=floor($this->width/$this->codeNum)*$i+3;$y=rand(0, $this->height-15);imagechar($this->image,$fontsize, $x, $y, $this->checkCode{$i},$fontcolor);}else{$fontsize=rand(12, 16);$x=floor(($this->width-8)/$this->codeNum)*$i+8;$y=rand($fontSize+5, $this->height);imagettftext($this->image,$fontsize,rand(-30, 30),$x,$y ,$fontcolor, $fontFace, $this->checkCode{$i});}}}private function outputImage() {if(imagetypes() & IMG_GIF){header("Content-Type:image/gif");imagepng($this->image);}else if(imagetypes() & IMG_JPG){header("Content-Type:image/jpeg");imagepng($this->image);}else if(imagetypes() & IMG_PNG){header("Content-Type:image/png");imagepng($this->image);}else if(imagetypes() & IMG_WBMP){header("Content-Type:image/vnd.wap.wbmp");imagepng($this->image);}else{die("PHP不支持图像创建");}}function __destruct(){imagedestroy($this->image);}}调用验证码类code.php php
showImage(); //输出到页面中供 注册或登录使用$_SESSION["code"]=$code->getCheckCode(); //将验证码保存到服务器中