PHP ถามเรื่อง DateTime หน่อยครับ จะ Check WorkDay หาวันเสาร์-อาทิตย์ จากวันที่ต่อไปนี้

<?php
$start = strtotime("2011-04-04 08:00:00"); // your start/end dates here
$end = strtotime("2011-04-29 08:50:00");

$saturday = strtotime("saturday", $start);

while($saturday < $end) {
		
    echo "วันเสาร์ = ", date("d m Y", $saturday), "\n"; 
	echo '<br>'; 
	
	$sunday = strtotime("+1 days", $saturday);
		
		if($sunday < $end ){   //+ เช็คเผื่อวันอาทิตย์อยู่วันที่ 1 ของเดือนใหม่
			echo "วันอาทิตย์ = ", date("d m Y", $sunday), "\n";  
			echo '<br>';   
		}
		
    $saturday = strtotime("+1 weeks", $saturday);
	
}
?>

function date_in_period($format, $start, $end, $skip = NULL){
	$output = array();
	$days = floor((strtotime($end) - strtotime($start))/86400);
	for($i=0;$i<=$days;$i++){
		$in_period = strtotime("+" . $i . " day", strtotime($start));
		if(is_array($skip) and in_array(date("D",$in_period), $skip)){
			continue;
		}
		array_push($output, date($format, $in_period));
	}
	return $output;
}
echo "No skipping : <br / >";
$date = date_in_period("D-d-m-Y", "2011-04-04", "2011-04-19");
foreach($date as $day){
	echo $day . "<br / >";
}
echo "Total : " . count($date) . " days<br / >";
echo "<br / ><br / >Has skipping : <br / >";
$date = date_in_period("D-d-m-Y", "2011-04-04", "2011-04-19", array("Mon", "Tue", "Wed", "Thu", "Fri"));
foreach($date as $day){
	echo $day . "<br / >";
}
echo "Total : " . count($date) . " days";

<?php
 
	$strStartDate = "2011-08-01";
	$strEndDate = "2011-08-15";
	
	$intWorkDay = 0;
	$intHoliday = 0;
	$intTotalDay = ((strtotime($strEndDate) - strtotime($strStartDate))/  ( 60 * 60 * 24 )) + 1; 

	while (strtotime($strStartDate) <= strtotime($strEndDate)) {
		
		$DayOfWeek = date("w", strtotime($strStartDate));
		if($DayOfWeek == 0 or $DayOfWeek ==6)  // 0 = Sunday, 6 = Saturday;
		{
			$intHoliday++;
			echo "$strStartDate = <font color=red>Holiday</font><br>";
		}
		else
		{
			$intWorkDay++;
			echo "$strStartDate = <b>Work Day</b><br>";
		}
		//$DayOfWeek = date("l", strtotime($strStartDate)); // return Sunday, Monday,Tuesday....

		$strStartDate = date ("Y-m-d", strtotime("+1 day", strtotime($strStartDate)));
	}

	echo "<hr>";
	echo "<br>Total Day = $intTotalDay";
	echo "<br>Work Day = $intWorkDay";
	echo "<br>Holiday = $intHoliday";
?>