<?php

/**

 *  Author: xiongwei

 *  Email:  695704253@qq.com

 *

 *  注：本代码需要要用到 msyh.ttf 字体，请自行下载

**/

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

//图像尺寸

$width=180;

$height=70;

//字体样式

 $font_style='./fontface/msyh.ttf';

//字体大小

$font_size=28;

//干扰点数量

$noise_num=40;

//干扰线数量

$line_num=10;

 $expression='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

 $expression=substr(str_shuffle($expression),0,4);

 $img=imagecreatetruecolor($width,$height);

 $bdcolor=imagecolorallocate($img,170,170,170);

 $bgcolor=imagecolorallocate($img,250,250,250);

imagefilledrectangle($img,0,0,$width,$height,$bgcolor);

imagerectangle($img,0,0,$width-1,$height-1,$bdcolor);

$x=10;

$y=ceil(($height+$font_size)/2);

for($i=0;$i<strlen($expression);$i++){

    imagettftext($img,$font_size,mt_rand(-30,30),$x,$y,imagecolorallocate($img,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255)),$font_style,$expression[$i]);

    $x+=30;

}

for($i=0;$i<$noise_num;$i++){

    imagesetpixel($img,mt_rand(1,$width-1),mt_rand(1,$height-1),imagecolorallocate($img,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255)));

}

for($i=0;$i<$line_num;$i++){

    imagearc($img,mt_rand(-10,0),mt_rand(-10,0),mt_rand(20,400),mt_rand(20,400),50,44,imagecolorallocate($img,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255)));

    //imagearc()

}

imagepng($img);

imagedestroy($img);

?>