<?php

function merge_simplepie() {
	if (func_num_args() > 0) {
		$args = func_get_args();
		$feed = new SimplePie();
		$feed->data = array();
		foreach ($args as $arg) {
			$feed->data = array_merge_recursive($feed->data, $arg->data);
		}
		usort($feed->data['items'], create_function('$a,$b', 'if ($a->date == $b->date) return 0; return ($a->date < $b->date) ? 1 : -1;'));
		return $feed;
	}
	else trigger_error('Cannot merge 0 instances of SimplePie', E_USER_WARNING);
}

?>