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 $this->checkcode;}private function createimage(){//创建图像资源 //bbs.it-home.org$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, $color);}}private function createcheckcode(){//这里主要产生随机码，从2开始是为了区分1和l$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});}}}//输出图象信息
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); //bbs.it-home.org}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($this->image);}}?>
复制代码
验证码类的调用示例：
showimage(); //输出到页面中供 注册或登录使用$_session[code]=$code->getcheckcode(); //将验证码保存到服务器中?>
复制代码