用PHP写一个验证码类,并进行封装。类名: validationcode.class.php代码如下:复制代码 代码如下:<?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;