Average calculator

<?php

function average($numbers=array())
{
	if (!is_array($numbers))
		$numbers = func_get_args();
	
	$sum = 0;
	$amt = count($numbers);
	
	foreach($numbers as $num)
		$sum += $num;
			
	return ($amt > 0) ? ($sum / $amt) : false; // no division by zero
}


/*
echo average(array(3,4,5)); // 4
echo average(50,30,40); // 40
*/

?>