/**
  * Get the compression flag
  * @return int Get the compression flag value
  */
 protected static function GetCompressionKind()
 {
     if (!isset(self::$COMPRESSION_KIND)) {
         if (version_compare(PHP_VERSION, '5.4.0', '>=') && version_compare(PHP_VERSION, '5.4.4', '<')) {
             self::$COMPRESSION_KIND = SOAP_COMPRESSION_DEFLATE;
         } else {
             self::$COMPRESSION_KIND = SOAP_COMPRESSION_GZIP;
         }
     }
     return self::$COMPRESSION_KIND;
 }