partkeepr:: replacement function for isTimezoneSetAndValid()

check.php

<?php
/**
* Checks if the timezone is set and valid.
*
* @param         none
* @return         bool         True if the timezone is set and valid, false otherwise.
*/
function isTimezoneSetAndValid () {
	$tz = date_default_timezone_get();
	if (empty($tz)) {
		return false;
	}

        return true;
}