PHP图像操作__验证码生成函数

 1 header('Content-type:text/html;charset=utf-8;');
 2 function imgcode($x,$y,$fontsize,$number,$fontfile,$bet=0)
 3 {
 4     $initimg=imagecreate($x,$y);
 5     $bgcolor=imagecolorallocate($initimg,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
 6     imagefill($initimg,0,0,$bgcolor);
 7 
 8     for($i=0;$i<150;$i++)
 9     {
10     $pxcolor=imagecolorallocate($initimg,mt_rand(0,155),mt_rand(0,155),mt_rand(0,155));
11     imagesetpixel($initimg,mt_rand(10,$x-10),mt_rand(10,$y-10),$pxcolor);
12     }
13     for($i=0;$i<3;$i++)
14     {
15     $linecolor=imagecolorallocate($initimg,mt_rand(0,155),mt_rand(0,155),mt_rand(0,155));
16     imageline($initimg,mt_rand(10,30),mt_rand(10,$y-10),mt_rand($x-30,$x-10),mt_rand(10,$y-10),$linecolor);
17     }
18     $str="1234567890abcdefghijklmnopqtuvwxyzABCDEFGHIJKLMNOQWTUVWXYZ";
19     $strimg="";
20     $strtotal="";
21     for($i=0;$i<$number;$i++)
22     {
23         $strimg=substr(str_shuffle($str),0,1);
24         $strtotal.=$strimg;
25         $textcolor=imagecolorallocate($initimg,mt_rand(0,100),mt_rand(0,100),mt_rand(0,100));
26         imagettftext($initimg,$fontsize,mt_rand(-20,20),($x-$fontsize*$number)/($number+1)+($bet+$fontsize)*$i,($y-$fontsize)/2+$fontsize,$textcolor,realpath($fontfile),$strimg);
27     }
28     
29     header('Content-type:image/jpeg');
30     imagejpeg($initimg,null,100);
31     imagedestroy($initimg);
32     return $strtotal;
33 }

1 $x=isset($_REQUEST['x'])?$_REQUEST['x']:200;
2 $y=isset($_REQUEST['y'])?$_REQUEST['y']:100;
3 $size=isset($_REQUEST['size'])?$_REQUEST['size']:20;
4 $num=isset($_REQUEST['num'])?$_REQUEST['num']:4;
5 $spac=isset($_REQUEST['spac'])?$_REQUEST['spac']:5;
6 imgcode($x,$y,$size,$num,'./FRAMDCN.TTF',$spac);