Proxy Checker

<?php

// debug
   error_reporting(0);
// you know
   $maximum_proxies_to_test = 50;
// password for page
   $password = '';

// let's roll
   function return_env_variables()
   {
      echo '<pre>'."\n";
      foreach ($_SERVER as $header => $value )
      {
        if ((strpos($header , 'REMOTE')!== false || strpos($header , 'HTTP')!== false || strpos($header , 'REQUEST')!== false) && ( strpos($header , 'HTTP_HOST') !== 0))
        {
        echo $header.' = '.$value."\n";
        }
      }
      echo '</pre>';
   }

// function to go away and get the page (calls through the proxy back to itself)
   function get_judge_page($proxy)
   {
   // Depending on the server environment, this timeout setting may not be available.
      $timeout = 15;
      $proxy_cont = '';
      list($proxy_host, $proxy_port) = explode(":", $proxy);
      $proxy_fp = fsockopen($proxy_host, $proxy_port, $errornumber, $errorstring, $timeout);
      if ($proxy_fp)
      {
         stream_set_timeout($proxy_fp, $timeout);
         fputs($proxy_fp, "GET " . $_SERVER['SCRIPT_NAME'] . "?test HTTP/1.0\r\nHost: " . $_SERVER['SERVER_NAME'] . "\r\n\r\n");
         while(!feof($proxy_fp))
         {
               $proxy_cont .= fread($proxy_fp,4096);
         }
         fclose($proxy_fp);
         $proxy_cont = substr($proxy_cont, strpos($proxy_cont,"\r\n\r\n")+4);
      }
      return $proxy_cont;
   }

// check for the control string to see if it's a valid fetch of the judge
   function check_valid_judge_response($page)
   {
      if(strlen($page) < 5)
         return false;
      return strpos($page, 'REMOTE_ADDR') !== false;
   }

// check for the IP addresses :3
   function check_anonymity($page)
   {
      if(strpos($page, $_SERVER['LOCAL_ADDR']) !== false)
         return false;
      return true;
   }

// takes and tests a proxy
// 0 - bad proxy
// 1 - good (non anonymous) proxy
// 2 - good (anonymous) proxy
   function test_proxy($proxy)
   {
      $page = get_judge_page($proxy);
      if(!check_valid_judge_response($page))
         return 0;
      if(!check_anonymity($page))
         return 1;
      return 2;
   }

// if this is a judge request, just return the environmental variables
   if(getenv('QUERY_STRING') == "test")
   {
      return_env_variables();
   }
// else check whether we have been passed a list of proxies to test or not
// should really use $_POST but it's been left as $HTTP_POST_VARS for older versions of PHP
   elseif( (isset($HTTP_POST_VARS['action']) && $HTTP_POST_VARS['action'] === 'fred') &&
           (isset($HTTP_POST_VARS['proxies']) && $HTTP_POST_VARS['proxies'] != '') &&
           ( (strlen($password) == 0) || (isset($HTTP_POST_VARS['password']) && $HTTP_POST_VARS['password'] === $password) ))
   {
      $proxies = explode("\n", str_replace("\r", "", $HTTP_POST_VARS['proxies']), $maximum_proxies_to_test + 1);

   // set the overall time limit for the page execution to 10 mins
      set_time_limit(600);

   // set up some arrays to hold the results
      $anon_proxies = array();
      $nonanon_proxies = array();
      $bad_proxies = array();

   // loop through and test the proxies
      for($thisproxy = 0; $thisproxy < ($maximum_proxies_to_test > count($proxies) ? count($proxies) : $maximum_proxies_to_test); $thisproxy += 1)
      {
           $draculalol = htmlspecialchars($proxies[$thisproxy]);
         echo '' . $draculalol . '';
         flush();
         switch(test_proxy($proxies[$thisproxy]))
         {
            case 2:
              echo ' - <font color="green">Анонимная</font><br>' . "\n";
               $anon_proxies[count($anon_proxies)] = $proxies[$thisproxy];
               break;
            case 1:
              echo ' - <font color="yellow">Не анонимная</font><br>' . "\n";
               $nonanon_proxies[count($nonanon_proxies)] = $proxies[$thisproxy];
               break;
            case 0:
              echo ' - <font color="red">Не рабочая</font><br>' . "\n";
               $bad_proxies[count($bad_proxies)] = $proxies[$thisproxy];
               break;
         }
      }

      echo '<pre>';
      echo '<br><b><font color="green" size="2">Анонимные прокси:</font></b>' . "\n";
      for($thisproxy = 0; $thisproxy < count($anon_proxies); $thisproxy += 1)
         echo $anon_proxies[$thisproxy] . "\n";
      echo '<br><b><font color="yellow" size="2">Не анонимные прокси:</font></b>' . "\n";
      for($thisproxy = 0; $thisproxy < count($nonanon_proxies); $thisproxy += 1)
         echo $nonanon_proxies[$thisproxy] . "\n";
      echo '<br><b><font color="red" size="2">Не рабочие прокси:</font></b>' . "\n";
      for($thisproxy = 0; $thisproxy < count($bad_proxies); $thisproxy += 1)
            $xek = htmlspecialchars($bad_proxies[$thisproxy]);
         echo $xek . "\n";
      echo '</pre>';
   }
// just a blank call of the page - show the form for the user to fill in
   else
   {

      echo '<form method="POST" action="' . $_SERVER['SCRIPT_NAME'] . '">' . "\n";
      echo '<input type="hidden" name="action" value="fred">' . "\n";
      echo '<textarea name="proxies" cols=50 rows=10></textarea><br>' . "\n";
      if(strlen($password) > 0)
         echo 'Password: <input type="password" name="password" size="15"><br>' . "\n";
      echo '<input type="submit" value="Старт">' . "\n";
      echo '</form>' . "\n";
   }
?>