/* {{{ Timezone Cache functions */
static timelib_tzinfo *php_date_parse_tzfile(char *formal_tzname, const timelib_tzdb *tzdb TSRMLS_DC)
{
	timelib_tzinfo *tzi, **ptzi;

	if(!DATEG(tzcache)) {
		ALLOC_HASHTABLE(DATEG(tzcache));
		zend_hash_init(DATEG(tzcache), 4, NULL, _php_date_tzinfo_dtor, 0);
	}

	if (zend_hash_find(DATEG(tzcache), formal_tzname, strlen(formal_tzname) + 1, (void **) &ptzi) == SUCCESS) {
		return *ptzi;
	}

	tzi = timelib_parse_tzfile(formal_tzname, tzdb);
	if (tzi) {
		zend_hash_add(DATEG(tzcache), formal_tzname, strlen(formal_tzname) + 1, (void *) &tzi, sizeof(timelib_tzinfo*), NULL);
	}
	return tzi;
Unknown