check PHP version

gistfile1.php

<?php
// Testing if we are dealing with version 5.3.0 or higher - prevent site crash if server uses older PHP version
if (version_compare(PHP_VERSION, '5.3.0', '>=')) {
		
	// PHP5 function here

} else {
	$error = "<strong>Invalid PHP version, unable to load WPFolio RSS feed. Check your server's PHP preferences and update to the latest PHP version.</strong>";
	echo $error;
}