/**

* 验证码类

*/

$code= new Code();

$code->outImage();

class Code

{

protected $number;

受保护的 $codeType;

受​​保护的 $width;

受​​保护的 $height;

受​​保护的 $image;

受​​保护的 $code;

公共函数 __construct($number=4,$codeType=2,$width= 100,$height=30)

{

$this->number=$number;

$this->codeType=$codeType;

$this->width=$width;

$this ->height=$height;

$this->code=$this->createCode();

}

public function __get($name){

if ($name=='code' ) {

return $this->code;

}else{

return false;

}

}

public function __destruct(){

imagedestroy($this->image);

}

protected function createCode(){

switch ($this->codeType) {

case '0':

$code=$this->getNumberCode();

break;

case ' 1':

$code=$this->getCharCode();

break;

case '2':

$code=$this->getNumberCharCode();

break;

默认值：

die("对不起，不支持该验证码类型！！！");

}

return $code;

}

protected function getNumberCode(){

$str=join('',range (0, 9));

return substr(str_shuffle($str), 0,$this->number);

}

protected function getCharCode(){

$str=join('',range (a, z));

$str=$str.strtoupper($str);

return substr(str_shuffle($str), 0,$this->number);

}

protected function getNumberCharCode (){

$str1=join('',range(0, 9));

$str=join('',range(a, z));

$str=$str1.$str. strtoupper($str);

return substr(str_shuffle($str), 0,$this->number);

}

public function outImage(){

$this->createImage();

$this->fillBack();

$this->drawChar();

$this->drawDistrub();

$this->show();

}

受保护函数createImage(){

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

}

protected function fillBack(){

imagefill($this->图像, 0, 0, $this->lightColor());

}

受保护函数 lightColor(){

        return  imagecolorallocate($this->image, mt_rand(130,255), mt_rand(130,255), mt_rand (130,255));

}

protected function darkColor(){

return  imagecolorallocate($this->image, mt_rand(0,120), mt_rand(0,120), mt_rand(0,120));

}

protected函数drawChar(){

for ($i=0; $i 数字； $i++) { 

$Width=$this->width/$this->number;

$x=mt_rand($i*$Width+10,($i+1)*$Width-15);

$y=mt_rand(0,$this->height-18);

imagechar( $this->image, 6, $x, $y, $this->code[$i], $this->darkColor());

}

}

protected function drawDistrub(){

for ($i=0; $i

$x=mt_rand(0,$this->宽度);

$y=mt_rand(0,$this->宽度);

$y=mt_rand(0,$this->宽度) height);

imagesetpixel($this->image, $x, $y, $this->lightColor());

}

}

protected function show(){

header("Content -类型:image/png");

imagepng($this->image);

}

}

?>