<?php class ValidationCode { private $width; private $height; private $codeNum; private $image; //图像资源 private $disturbColorNum; private $checkCode; function __construct($width=80, $height=20, $codeNum=4){ $this->width=$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; $i<$this->disturbColorNum; $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<10; $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 < $this->codeNum; $i++){ $char=$code{rand(0, strlen($code)-1)}; $string.=$char; } return $string; } private function outputText($fontFace=""){ for($i=0; $i<$this->codeNum; $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); } }
使用如下：
测试，调用验证码类
code.php