运行结果：

<!--vcode.class.php内容-->

<?php

class Vcode {

private $width; //宽

private $height; //高

private $num; //数量

private $code; //验证码

private $img; //图像的资源

//构造方法， 三个参数

function __construct($width, $height, $num) {

$this->width = $width;

$this->height = $height;

$this->num = $num;

$this->code = $this->createcode(); //调用自己的方法

}

//获取字符的验证码， 用于保存在服务器中

function getcode() {

return $this->code;

}

//输出图像

function outimg() {

//创建背景 (颜色， 大小， 边框)

$this->createback();

//画字 (大小， 字体颜色)

//干扰元素(点， 线条)

//输出图像

$this->printimg();

}

//创建背景

private function createback() {

//创建资源

$this->img = imagecreatetruecolor($this->width, $this->height);

//设置随机的背景颜色

$bgcolor = imagecolorallocate($this->img, rand(225, 255), rand(225, 255), rand(225, 255));

//设置背景填充

imagefill($this->img, 0, 0, $bgcolor);

//画边框

$bordercolor = imagecolorallocate($this->img, 0, 0, 0);

imagerectangle($this->img, 0, 0, $this->width-1, $this->height-1, $bordercolor);

}

//画字

private function outstring() {

}

//设置干扰元素

private function setdisturbcolor() {

}

//输出图像

private function printimg() {

if (imagetypes() & IMG_GIF) {

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

imagegif($this->img);

} elseif (function_exists("imagejpeg")) {

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

imagegif($this->img);

} elseif (imagetypes() & IMG_PNG) {

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

imagegif($this->img);

} else {

die("No image support in this PHP server");

}

}

//生成验证码字符串

private function createcode() {

$codes = "3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKLMNPQRSTUVWXY";

$code = "";

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

$code .=$codes{rand(0, strlen($codes)-1)};

}

return $code;

}

//用于自动销毁图像资源

function __destruct() {

imagedestroy($this->img);

}

}