Get the previous business day from a timestamp

gistfile1.php

<?php
function previous_business_day($timestamp, $holidays = array()) {
	do {
		$timestamp = $timestamp - 86400;
		$day_of_week = date('l', $timestamp);
		$due = date('Y-m-d', $timestamp);
	} while (in_array($day_of_week, array('Sunday', 'Saturday')) || in_array($due, $holidays));
	$checkdate = date('l Y-m-d', $timestamp);
	return $checkdate;
}