php源码 验证码 类

<?php class auth { private $width; //宽度 private $height; //高度 private $codeNum; //随机数变量 private $checkCode; private $img; private $level; function __construct($width=80,$height=30,$codeNum=4){ $this->width = $width; $this->height = $height; $this->codeNum = $codeNum; $this->checkCode = $this->createCode(); //调用创建数字函数 } //产生随机数 private function createCode(){ for($i=0;$i<$this->codeNum;$i++){ $rand = rand(1,3); switch($rand){ case 1: $asciiNum = rand(48,57); break; case 2: $asciiNum = rand(65,90); break; case 3: $asciiNum = rand(97,122); break; } $ass.=sprintf('%c',$asciiNum); } return $ass; } function showImg(){ //第一步 产生画布 并为画布添加颜色 $this->createImg(); $this->createMap(); //第二步 定义背景颜色 及 画笔 $this->createBgcolor(); //第三步 产生干扰 //第四步 写字 //第五步 输出 $this->outPutAuth(); //销毁 } //创建一个真彩图像 imagecreatetruecolor() private function createImg(){ $this->img = imagecreatetruecolor($this->width,$this->height); } //画一个矩形 并填充imagefilledrectangle(); private function createMap(){ imagefilledrectangle($this->img,0,0,80,30,$this->createBgcolor()); } //为一幅图画分配颜色 imagecolorallocate(); private function createBgcolor(){ return imagecolorallocate($this->img,rand(0,155),rand(120,255),rand(40,105)); } //imagetypes imagepng查手册 private function outPutAuth(){ if(imagetypes()&IMG_PNG){ imagepng($this->img); } } // function auth() { // } } $newauth = new auth(); $newauth->showImg(); ?>