title: FILTER_FLAG_STRIP_LOW vs FILTER_FLAG_STRIP_HIGH?
body: <p>In reference to the <code>filter_var</code> function in PHP 5:</p>
  <p>I have visited its documentation at: <a href="http://php.net/manual/en/filter.filters.sanitize.php" rel="nofollow noreferrer">http://php.net/manual/en/filter.filters.sanitize.php</a>, but I still have this question:</p>
  <p>What are the <strong>exact</strong> differences?</p>
  <p>For simpler clarification, please provide an example.</p>