PHP验证码文件类

转自：http://www.blhere.com/1165.html

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<?php class CCheckCodeFile { //验证码位数 private $mCheckCodeNum  = 4;   //产生的验证码 private $mCheckCode   = '';   //验证码的图片 private $mCheckImage  = '';   //干扰像素 private $mDisturbColor  = '';   //验证码的图片宽度 private $mCheckImageWidth = '80';   //验证码的图片宽度 private $mCheckImageHeight  = '20';   /** * * @brief   输出头 * */ private function OutFileHeader() {   header ("Content-type: image/png"); }   /** * * @brief   产生验证码 * */ private function CreateCheckCode() {   $this->mCheckCode = strtoupper(substr(md5(rand()),0,$this->mCheckCodeNum));    return $this->mCheckCode; }   /** * * @brief   产生验证码图片 * */ private function CreateImage() {   $this->mCheckImage = @imagecreate ($this->mCheckImageWidth,$this->mCheckImageHeight);   imagecolorallocate ($this->mCheckImage, 200, 200, 200);    return $this->mCheckImage; }   /** * * @brief   设置图片的干扰像素 * */ private function SetDisturbColor() {    for ($i=0;$i<=128;$i++)    {    $this->mDisturbColor = imagecolorallocate ($this->mCheckImage, rand(0,255), rand(0,255), rand(0,255));    imagesetpixel($this->mCheckImage,rand(2,128),rand(2,38),$this->mDisturbColor);    } }   /** * * @brief   设置验证码图片的大小 * * @param   $width   宽 * * @param   $height 高 * */ public function SetCheckImageWH($width,$height) {    if($width==''||$height=='')return false;   $this->mCheckImageWidth  = $width;   $this->mCheckImageHeight = $height;    return true; }   /** * * @brief   在验证码图片上逐个画上验证码 * */ private function WriteCheckCodeToImage() {    for ($i=0;$i<=$this->mCheckCodeNum;$i++)    {    $bg_color = imagecolorallocate ($this->mCheckImage, rand(0,255), rand(0,128), rand(0,255));    $x = floor($this->mCheckImageWidth/$this->mCheckCodeNum)*$i;    $y = rand(0,$this->mCheckImageHeight-15);    imagechar ($this->mCheckImage, 5, $x, $y, $this->mCheckCode[$i], $bg_color);    } }   /** * * @brief   输出验证码图片 * */ public function OutCheckImage() {   $this ->OutFileHeader();   $this ->CreateCheckCode();   $this ->CreateImage();   $this ->SetDisturbColor();   $this ->WriteCheckCodeToImage();   imagepng($this->mCheckImage);   imagedestroy($this->mCheckImage); } } $c_check_code_image = new CCheckCodeFile(); //$c_check_code_image ->SetCheckImageWH(100,50);//设置显示验证码图片的尺寸 $c_check_code_image ->OutCheckImage(); ?>