Online PHP editor | refs for dlqCt

<?php if(version_compare(PHP_VERSION, '5.2') < 0) return; echo 'FILTER_FLAG_IPV4 = ', dechex(FILTER_FLAG_IPV4), "\n"; echo 'FILTER_FLAG_IPV6 = ', dechex(FILTER_FLAG_IPV6), "\n"; echo 'FILTER_FLAG_NO_PRIV_RANGE = ', dechex(FILTER_FLAG_NO_PRIV_RANGE), "\n"; echo 'FILTER_FLAG_NO_RES_RANGE = ', dechex(FILTER_FLAG_NO_RES_RANGE), "\n";