PHP code 验证码生成类定义和简单使用示例

<?php
namespace code;
/**
* Class Code
*/
class Code
{
protected $number;//验证码内字符个数
protected $codeType;//验证码样式
protected $width;//图像宽
protected $height;//图像高
protected $code;//验证码
protected $image;//图像资源
/**
* Code constructor.
* @param int $number
* @param int $codeType
* @param int $width
* @param int $height
*/
public function __construct($number=5, $codeType=2, $width=100, $height=40)
{
$this- number = $number;
$this- codeType = $codeType;
$this- width = $width;
$this- height = $height;
$this- code = $this- createCode();
}
/**
* 销毁资源
*/
public function __destruct()
{
imagedestroy($this- image);
}
/**
* 外部调用code时触发
* @param $name
* @return bool
*/
public function __get($name)
{
if ('code' == $name) {
return $this- $name;
} else {
return false;
}
}
/**
* 生成code
*/
protected function createCode()
{
switch ($this- codeType) {
case 0:
$code = $this- getNum();
break;
case 1:
$code = $this- getChar();
break;
case 2:
$code = $this- getNumChar();
break;
default:
die('样式不对');
}
return $code;
}
/**
* 数字验证码
* @return string
*/
protected function getNum()
{
$str = join('', range(0,9));
return substr(str_shuffle($str), 0, $this- number);
}
/**
* 字符验证码
* @return string
*/
protected function getChar()
{
$str = join('', range('a', 'z'));
$str = $str . strtoupper($str);
return substr(str_shuffle($str), 0, $this- number);
}
/**
* 字符和数字混合验证码
* @return string
*/
protected function getNumChar()
{
$num = join('', range(0, 9));
$str = join('', range('a', 'z'));
$str_big = strtoupper($str);
$numChar = $num . $str . $str_big;
return substr(str_shuffle($numChar), 0, $this- number);
}
/**
* 生成图像
*/
protected function createImage()
{
$this- image = imagecreatetruecolor($this- width, $this- height);
}
/**
* 填充背景色
*/
protected function fillColor()
{
imagefill($this- image, 0, 0, $this- lightColor());
}
/**
* 浅颜色
* @return int
*/
protected function lightColor()
{
return imagecolorallocate($this- image, mt_rand(170, 255), mt_rand(170, 255), mt_rand(170, 255));
}
/**
* 深颜色
* @return int
*/
protected function darkColor()
{
return imagecolorallocate($this- image, mt_rand(0, 120), mt_rand(0, 120), mt_rand(0, 120));
}
/**
* 添加验证码字符
*/
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 - 5));
$y = mt_rand(0, $this- height - 15);
imagechar($this- image, 5, $x, $y, $this- code[$i], $this- darkColor());
}
}
/**
* 添加干扰点
*/
protected function drawDisturb()
{
for ($i= 0; $i < 100; $i++) {
imagesetpixel($this- image, mt_rand(0, $this- width), mt_rand(0, $this- height), $this- darkColor());
}
}
/**
* 添加干扰线
*/
protected function drawArc()
{
for ($i = 0; $i < $this- number - 3; $i++) {
imagearc($this- image, mt_rand(5, $this- width), mt_rand(5, $this- height), mt_rand(5, $this- width), mt_rand(5, $this- height),mt_rand(0, 70), mt_rand(300, 360), $this- darkColor());
}
}
/**
* 输出显示
*/
protected function show()
{
header('Content-Type:image/png');
imagepng($this- image);
}
/**
* 外部image
*/
public function outImage()
{
$this- createImage();//创建画布
$this- fillColor();//填充背景色
$this- drawChar();//添加验证字符
$this- drawDisturb();//添加干扰点
$this- drawArc();//添加干扰线
$this- show();//输出
}
}

<?php
include './code/Code.php';
$code = new code\Code();
$code- outImage();
session_start();
$_SESSION['code'] = [
'code' =  $code- code,
'exp_time' =  time() + (60 * 60 * 10),
];