本文实例讲述了php实现的验证码文件类。分享给大家供大家参考。具体如下：

/**

* @file

* @version 1.0

* @author 网海浪子

* @brief 验证码文件类

*

*/

class ccheckcodefile

{

//验证码位数

private $mcheckcodenum = 4;

//产生的验证码

private $mcheckcode = '';

//验证码的图片

private $mcheckimage = '';

//干扰像素

private $mdisturbcolor = '';

//验证码的图片宽度

private $mcheckimagewidth = '80';

//验证码的图片宽度

private $mcheckimageheight = '20';

/**

*

* @brief 输出头

*

*/

private function outfileheader()

{

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

}

/**

*

* @brief 产生验证码

*

*/

private function createcheckcode()

{

$this->mcheckcode = strtoupper(substr(md5(rand()),0,$this->mcheckcodenum));

return $this->mcheckcode;

}

/**

*

* @brief 产生验证码图片

*

*/

private function createimage()

{

$this->mcheckimage = @imagecreate ($this->mcheckimagewidth,$this->mcheckimageheight);

imagecolorallocate ($this->mcheckimage, 200, 200, 200);

return $this->mcheckimage;

}

/**

*

* @brief 设置图片的干扰像素

*

*/

private function setdisturbcolor()

{

for ($i=0;$i<=128;$i++)

{

$this->mdisturbcolor = imagecolorallocate ($this->mcheckimage, rand(0,255), rand(0,255), rand(0,255));

imagesetpixel($this->mcheckimage,rand(2,128),rand(2,38),$this->mdisturbcolor);

}

}

/**

*

* @brief 设置验证码图片的大小

*

* @param $width 宽

*

* @param $height 高

*

*/

public function setcheckimagewh($width,$height)

{

if($width==''||$height=='')return false;

$this->mcheckimagewidth = $width;

$this->mcheckimageheight = $height;

return true;

}

/**

*

* @brief 在验证码图片上逐个画上验证码

*

*/

private function writecheckcodetoimage()

{

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

{

$bg_color = imagecolorallocate ($this->mcheckimage, rand(0,255), rand(0,128), rand(0,255));

$x = floor($this->mcheckimagewidth/$this->mcheckcodenum)*$i;

$y = rand(0,$this->mcheckimageheight-15);

imagechar ($this->mcheckimage, 5, $x, $y, $this->mcheckcode[$i], $bg_color);

}

}

/**

*

* @brief 输出验证码图片

*

*/

public function outcheckimage()

{

$this ->outfileheader();

$this ->createcheckcode();

$this ->createimage();

$this ->setdisturbcolor();

$this ->writecheckcodetoimage();

imagepng($this->mcheckimage);

imagedestroy($this->mcheckimage);

}

}

$c_check_code_image = new ccheckcodefile();

//$c_check_code_image ->setcheckimagewh(100,50);

//设置显示验证码图片的尺寸

$c_check_code_image ->outcheckimage();

?>

希望本文所述对大家的php程序设计有所帮助。

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