Calculate different between two date

datediff.php

<?php
function daysTo($from, $to, $round=true)
{
	$diff = $to-$from;
	$days = ($diff/86400)+1;
	return $round==true ? floor($days) : round($days,2);
} 

//usage
$from = strtotime($start_date); // tarikh mula
$to = strtotime($end_date); //tarikh akhir
echo daysTo($from, $to, false);