php实现的验证码文件类实例_PHP

本文实例讲述了php实现的验证码文件类。分享给大家供大家参考。具体如下：

<?php
/**
* @file
* @version 1.0
* @author  网海浪子
* @brief   验证码文件类
*
*/
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(); ?>

希望本文所述对大家的php程序设计有所帮助。