PHP实现的封装验证码类详解

PHP 2018-12-30

用PHP写一个验证码类，并进行封装。

类名： validationcode.class.PHP

代码如下：
<div class="codetitle"><a style="CURSOR: pointer" data="69439" class="copybut" id="copybut69439" onclick="doCopy('code69439')"> 代码如下:

<div class="codebody" id="code69439">
<?PHP
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),255));
//为背景添充颜色
imagefill($this->image,$backColor);
//设置边框颜色
$border=imagecolorallocate($this->image,0);
//画出矩形边框
imagerectangle($this->image,$this->width-1,$this->height-1,$border);
}
private function setdisturbColor(){
for($i=0; $i<$this->disturbColorNum; $i++){
$color=imagecolorallocate($this->image,rand(0,255));
imagesetpixel($this->image,rand(1,$this->width-2),$this->height-2),$color);
}
for($i=0; $i<10; $i++){
$color=imagecolorallocate($this->image,rand(200,255));
imagearc($this->image,rand(-10,$this->width),$this->height),rand(30,300),rand(20,200),55,44,$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,128),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,rand(-30,30),$fontcolor,$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);
}
}

使用如下：

测试，调用验证码类

code.PHP
<div class="codetitle"><a style="CURSOR: pointer" data="61153" class="copybut" id="copybut61153" onclick="doCopy('code61153')"> 代码如下:

<div class="codebody" id="code61153">
<?PHP
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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