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php编写生成酷炫验证码 - 六月天空的芬芳

WBOY
WBOYOriginal
2016-05-20 11:39:341080browse
 1 php
 2 $im=imagecreate(200,100);//生成画布
 3 imagecolorallocate($im,0,0,0);//背景色
 4 $white=imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));//生成随机颜色
 5 for($i=0;$i$i++)
 6 {
 7     imageline($im,rand(0,200),rand(0,100),rand(0,200),rand(0,100),$white);//生成干扰线条元素
 8 }
 9 for($i=0;$i$i++)
10 {
11     imagesetpixel($im,rand(0,200),rand(0,100),$white);//生成干扰点元素
12 }
13 for($i=0,$str='';$i$i++)//通过循环获得四个字符
14 {
15     switch(rand(1,3))
16     {
17         case'1':
18         $ch=rand(0,9);
19         break; 
20         case'2':
21         $ch=sprintf('%c',rand(97,122));
22         break;
23         case'3':
24         $ch=sprintf('%c',rand(65,90));
25         break;
26     }
27         $str.=$ch;
28 
29 }
30 imagettftext($im,32,rand(0,15),55,70,$white,'c.ttc',$str);//在画布上输出字符串
31 header("Content-type:image/jpeg");
32 imagejpeg($im);
33 imagedestroy($im);
34 ?>

 

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