1 
     0){ 5         $temp=rand(1,3); 6         switch($temp){ 7             case 1: 8                 $chars[]=sprintf("%c",rand(65,90)); 9                 break;10             case 2:11                 $chars[]=sprintf("%c",rand(97,122));12                 break;13             case 3:14                 $chars[]=sprintf("%c",rand(48,57));15                 break;16         }17     }18     $str='';19     foreach($chars as $v){20         $str.=$v;21     }22     setcookie('checkcode',$str);23     $img = imagecreatetruecolor(count($chars)*9+18+($length_x-1)*10, 40);//924     $gray = imagecolorallocate($img, 0xC0,0xC0,0xC0);25     $dark_gray = imagecolorallocate($img, 0xAA,0xAA,0xAA);26     $bgcolor = imagecolorallocate($img, rand(0,255),rand(0,255),rand(0,255));27     imagefill($img, 0, 0, $bgcolor);28     $x=9;29     for($i=0;$i
     

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     验证码正确!{
   $_GET[checkcode]}";18         else19             echo "  验证码错误!";20     }21     //6-21.php22 ?>23 24