[PHP] [Codeschnipsel] Überprüfen, ob eine Website erreichbar ist

<?php 
  /**
   * @author ComFreek http://www.tutorials.de/members/comfreek.html
   * @license Free software but if you like this code snippet, you can make a link!  
   * http://www.tutorials.de/members/comfreek.html    
   */     
  
  /** 
   * Checks if a website or file is available 
   * @param string $WebsiteURL The website URL or file to check
   * @param boolean $GETRequest='true' If you pass TRUE, a GET request will also be made
   * @param int $Port='80' The port to use in fsockopen()
   * @param $Timeout='5' The timeout in seconds to use in fsockopen()         
   * 
   * @return boolean Returns TRUE if the handle of fsockopen() (if $GETRequest=true and fwrite()) was valid
   * 
   * @uses fsockopen()         
   * @uses fwrite()
   * @uses fclose()   
   */      
  function WebsiteAvailable($WebsiteURL, $GETRequest=true, $Port=80, $Timeout=5) 
  { 
    $ErrorNumber = NULL;
    $ErrorMessage = "";
    $FileHandle = @fsockopen($WebsiteURL, $Port, $ErrorNumber, $ErrorMessage, $Timeout);
    if ($FileHandle)
    {
      if ($GETRequest)
      {
        $HTTPString = "GET / HTTP/1.1\r\n";
        $HTTPString .= "Host: ".$WebsiteURL."\r\n";
        $HTTPString .= "Connection: Close\r\n\r\n";
      
        $WrittenBytes = @fwrite($FileHandle, $HTTPString);
        fclose($FileHandle);
        if ($WrittenBytes>0)
          return true;
        else
          return false;      
      }   
      fclose($FileHandle); 
      return true; 
    } 
    else 
    { 
      return false; 
    } 
  }
?>