PHP中验证码类及使用方法

	 

	备注:将公共页面加入session_start();

	 

	<?php

	session_start();

	ini_set('display_errors', 'Off');

	class CCheckCodeFile

	{

	       //验证码位数 www.zzzyk.com

	 

	       var $mCheckCodeNum  = 4;

	 

	       //产生的验证码

	       var $mCheckCode   = '';

	 

	       //验证码的图片

	       var $mCheckImage  = '';

	 

	       //干扰像素

	       var $mDisturbColor  = '';

	 

	       //验证码的图片宽度

	       var $mCheckImageWidth = '80';

	 

	       //验证码的图片宽度

	       var $mCheckImageHeight  = '20';

	 

	       //输出头

	       function OutFileHeader()

	       {

	              header ("Content-type: image/png");

	       }

	 

	       //产生验证码

	       function CreateCheckCode()

	       {

	              //$this->mCheckCode = strtoupper(substr(md5(rand()),0,$this->mCheckCodeNum));

	              $this->mCheckCode = strtoupper(substr(rand(0,9999999999),0,$this->mCheckCodeNum));

	              session_cache_expire(60);

	              session_start();

	              $_SESSION["code_str"] = $this->mCheckCode;

	              return $this->mCheckCode;

	       }

	 

	       //产生验证码图片

	       function CreateImage()

	       {

	              $this->mCheckImage = @imagecreate ($this->mCheckImageWidth,$this->mCheckImageHeight);

	              imagecolorallocate ($this->mCheckImage, 255, 255, 255);

	              return $this->mCheckImage;

	       }

	 

	       //设置图片的干扰像素

	       function SetDisturbColor()

	       {

	              for ($i=0;$i<=128;$i++)

	              {

	                     $this->mDisturbColor = imagecolorallocate ($this->mCheckImage, rand(0,255), rand(0,255), rand(0,255));

	                     imagesetpixel($this->mCheckImage,rand(1,100),rand(1,100),$this->mDisturbColor);

	              }

	       }

	 

	       //设置验证码图片的大小\宽\高

	       function SetCheckImageWH($width,$height)

	       {

	              if($width==''||$height=='')return false;

	              $this->mCheckImageWidth  = $width;

	              $this->mCheckImageHeight = $height;

	              return true;

	       }

	 

	       //在验证码图片上逐个画上验证码

	       function WriteCheckCodeToImage()

	       {

	              for ($i=0;$i<=$this->mCheckCodeNum;$i++)

	              {

	                     $bg_color = imagecolorallocate ($this->mCheckImage, rand(0,255), rand(0,255), 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);

	              }

	       }

	 

	       //输出验证码图片

	       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();

	?>

	 

	 

	 

	使用方法:

	<tr>

	      <td align="center" valign="

补充：Web开发 , php ,

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