公司组织 hackathon

能力有限，只做出来了两道题，悔恨啊。。。。。
1.  
  $content=file_get_contents('~~:88/hackathon/stage1.txt');
     $lines = explode("\n", $content);
     foreach($lines as $key => $val){
         echo '<br/>';
         if(md5($val)=='c4d4198fee6293e3d057f7c5540c2950'){
             var_dump($key);
             var_dump($val);
         }

     }

  2.
  $url='~~~:88/hackathon/stage2.file';

    $curl=curl_init($url);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curl, CURLOPT_RANGE,"0-499");
    $before=curl_exec ($curl);
     curl_close($curl);

    $curls=curl_init($url);
    curl_setopt($curls, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curls, CURLOPT_RANGE,"-500");
     $end=curl_exec ($curls);
     curl_close($curls);
     file_put_contents('d.txt',$before.$end );
    print_r('==');

     print_r(md5_file('d.txt'));