杰克森,新恋爱时代程惠,谢双灵
我要评论<?php
$code = new code();
$code->outimage();
class code
{
//验证码个数
protected $number;
//验证码类型
protected $codetype;
//图像宽度
protected $width;
//图像高度
protected $height;
//图像资源
protected $image;
//验证码字符串
protected $code;
/**
* undocumented function
*
* @param integer $number
* @param integer $codetype
* @param integer $width
* @param integer $height
*/
public function __construct($number = 4, $codetype = 2, $width = 100, $height = 50)
{
//初始化自己的成员属性
$this->number = $number;
$this->codetype = $codetype;
$this->width = $width;
$this->height = $height;
//生成验证码函数
$this->code = $this->createcode();
}
/**
* 析构函数
* 释放图像资源
*/
public function __destruct()
{
//释放图像资源
imagedestroy($this->image);
}
/**
* //魔术方法 通过对象获取保护的code
* $code = new code();
* echo $code->code;
*
* @param [type] $name
* @return void
*/
public function __get($name)
{
if ($name == 'code') {
return $this->code;
}
return false;
}
/**
* 获取验证码
*
* @return void
*/
protected function createcode()
{
//通过你的验证码类型给你生成不同的验证码
switch ($this->codetype) {
case 0: //纯数字
$code = $this->getnumbercode();
break;
case 1: //纯字母
$code = $this->getcharcode();
break;
case 2: //字母和数字混合
$code = $this->getnumcharcode();
break;
default:
die('不支持这种验证码类型');
}
return $code;
}
/**
* 生成纯数字验证码
*
* @return void
*/
protected function getnumbercode()
{
// $startnum = pow(10, $this->number - 1);
// $endnum = pow(10, $this->number) - 1;
// $str = rand($startnum, $endnum);
// return $str;
$str = join('', range(0, 9));
return substr(str_shuffle($str), 0, $this->number);
}
/**
* 生成纯字母验证码
*
* @return void
*/
protected function getcharcode()
{
$str = join('', range('a', 'z'));
$str = $str . strtoupper($str);
return substr(str_shuffle($str), 0, $this->number);
}
/**
* 生成字母和数字验证码
*
* @return void
*/
protected function getnumcharcode()
{
$numstr = join('', range(0, 9));
$str = join('', range('a', 'z'));
$str = $numstr . $str . strtoupper($str);
return substr(str_shuffle($str), 0, $this->number);
}
/**
* 创建画布
*
* @return void
*/
protected function createimage()
{
$this->image = imagecreatetruecolor($this->width, $this->height);
}
/**
* 填充背景颜色
*
* @return void
*/
protected function fillback()
{
imagefill($this->image, 0, 0, $this->lightcolor());
}
/**
* 随机生成浅颜色
*
* @return void
*/
protected function lightcolor()
{
return imagecolorallocate($this->image, mt_rand(130, 255), mt_rand(130, 255), mt_rand(130, 255));
}
/**
* 随机生成深颜色
*
* @return void
*/
protected function darkcolor()
{
return imagecolorallocate($this->image, mt_rand(0, 120), mt_rand(0, 120), mt_rand(0, 120));
}
/**
* 将验证码字符串画到画布中
*
* @return void
*/
protected function drawchar()
{
$width = ceil($this->width / $this->number);
for ($i = 0; $i < $this->number; $i++) {
$x = mt_rand($i * $width+5, ($i + 1) * $width - 10);
$y = mt_rand(0, $this->height - 15);
imagechar($this->image, 5, $x, $y, $this->code[$i], $this->darkcolor());
}
}
/**
* 添加干扰项
*
* @return void
*/
protected function drawdisturb()
{
for ($i = 0; $i < 150; $i++) {
$x = mt_rand(0, $this->width);
$y = mt_rand(0, $this->height);
imagesetpixel($this->image, $x, $y, $this->lightcolor());
}
}
/**
* 输出并且显示
*
* @return void
*/
protected function show()
{
header('content-type:image/png');
imagepng($this->image);
}
public function outimage()
{
//创建画布
$this->createimage();
//填充背景色
$this->fillback();
//将验证码字符串画到画布中
$this->drawchar();
//添加干扰项
$this->drawdisturb();
//输出并且显示
$this->show();
}
}
运行效果：
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