PHP封装验证码类的解决办法

这篇文章主要为大家详细介绍了PHP封装验证码类的简单示例，具有一定的参考价值，可以用来参考一下。

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代码如下:

<?php
/*   php教程 www.512Pic.com   */

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);
 }
}

代码如下:

<?php
/*   php教程 www.512Pic.com   */

session_start();
include "validationcode.class.php";
$code=new ValidationCode(80, 20, 4);
$code->showImage(); //输出到页面中供 注册或登录使用
$_SESSION["code"]=$code->getCheckCode(); //将验证码保存到服务器中

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