Set default business opening hours as a multidimensional array. Allow for 2 types of exceptions (closed and bank holidays) then return the opening hours in a number of useful ways, including a JS powered "we are open/closed" thingy.

business-hours.php

<?php

date_default_timezone_set('Europe/London');

// Define normal opening hours in nested arrays

$days = array(
			'monday'   	=> array('label' => 'Monday', 	'open' => '09:30', 'close' => '22:00'),
			'tuesday' 	=> array('label' => 'Tuesday', 	'open' => '09:30', 'close' => '22:00'),
			'wednesday'	=> array('label' => 'Wednesday','open' => '09:30', 'close' => '22:00'),
			'thursday' 	=> array('label' => 'Thursday', 'open' => '09:30', 'close' => '22:00'),
			'friday' 	=> array('label' => 'Friday', 	'open' => '09:30', 'close' => '21:00'),
			'saturday' 	=> array('label' => 'Saturday', 'open' => '10:00', 'close' => '18:00'),
			'sunday' 	=> array('label' => 'Sunday', 	'open' => '10:00', 'close' => '18:00')
			);

// Check what day and date it is now

	$todayday  = date('l');
	$todaydate = date('Ymd');

// Pull in exceptions

	$closed = array();	
	$bankholidays = array();

// If today is in the bank holiday list, apply Sunday opening hours.
// Otherwise, pull in todays opening hours from the $days array, 


	if(in_array($todaydate, $bankholidays)):	$todayhours = $days['sunday'];
		elseif($todayday == 'Monday'):		$todayhours = $days['monday'];
		elseif(	$todayday == 'Tuesday'):	$todayhours = $days['tuesday'];
		elseif(	$todayday == 'Wednesday'):	$todayhours = $days['wednesday'];
		elseif(	$todayday == 'Thursday'):	$todayhours = $days['thursday'];
		elseif(	$todayday == 'Friday'):		$todayhours = $days['friday'];
		elseif(	$todayday == 'Saturday'):	$todayhours = $days['saturday'];
		elseif(	$todayday == 'Sunday'):		$todayhours = $days['sunday'];
	endif;

// Set up a range by concatenating todays date and opening and closing times from the array above

	$todayopen   = date('Y-m-d ') . $todayhours['open'];
	$todayclosed = date('Y-m-d ') . $todayhours['close'];
	$now 	     = date('Y-m-d H:i');

?>


<h1>Opening Hours</h1>
<p>Standard opening hours with no exceptions.</p>

<table>
	<thead>
		<tr>
			<th>Day</th>
			<th>Open</th>
			<th>Closed</th>
		</tr>
	</thead>

	<?php foreach ($days as $day): ?>
	<tr>
		<td data-title="Day"><?php echo $day['label']; ?></td>
		<td data-title="Open"><?php echo $day['open']; ?></td>
		<td data-title="Centre Closing"><?php echo $day['close']; ?></td>
	</tr>
	<?php endforeach; ?>

</table>


<!-- Check if now is later than today's opening time and earlier than todays closing time -->

<div id="door-sign"><?php echo $todayhours['open'] . ' - ' . $todayhours['close']; ?></div>

<script type="text/javascript">

	now = new Date();
	nowHours = now.getHours();
	nowMinutes = now.getMinutes();
	nowTime = (nowHours + "." + nowMinutes)

	open = <?php echo date('G.i' , strtotime($todayhours['open'])); ?>; 
	close = <?php echo date('G.i' , strtotime($todayhours['close'])); ?>;
	
if(open <= nowTime && nowTime < close){
		document.getElementById('door-sign').innerHTML = 'We Are Open';
	}else{
		document.getElementById('door-sign').innerHTML = 'We Aint Open';
		}

</script>

<h1>Today&rsquo;s Opening Hours</h1>
<?php if(in_array($todaydate, $closed)): ?>

	<p>We are closed today.</p>

<?php else: ?>

<dl>
	<dt>Open</dt>
		<dd><?php echo $todayhours['open']; ?></dd>
	<dt>Closed</dt>
		<dd><?php echo $todayhours['close']; ?></dd>
</dl>

<?php endif; ?>


<h1>The Next 7 Days</h1>

<table>
	<thead>
		<tr>
			<th>Day</th>
			<th>Open</th>
			<th>Closed</th>
		</tr>
	</thead>

<?php 

// For each of the next 14 days 

foreach( range(0,6) as $add ): 
	
	$weekday_calc = date('Ymd',strtotime( "today + $add day") ); 
	$weekday = date('D jS F',strtotime( "today + $add day") );
	$weekday_hours_day = date('l',strtotime( "today + $add day") );

	if(in_array($weekday_calc, $bankholidays)): 	$weekdayhours = $days['sunday'];
		elseif( $weekday_hours_day == 'Monday'):	$weekdayhours = $days['monday'];
		elseif(	$weekday_hours_day == 'Tuesday'):	$weekdayhours = $days['tuesday'];
		elseif(	$weekday_hours_day == 'Wednesday'):	$weekdayhours = $days['wednesday'];
		elseif(	$weekday_hours_day == 'Thursday'):	$weekdayhours = $days['thursday'];
		elseif(	$weekday_hours_day == 'Friday'):	$weekdayhours = $days['friday'];
		elseif(	$weekday_hours_day == 'Saturday'):	$weekdayhours = $days['saturday'];
		elseif(	$weekday_hours_day == 'Sunday'):	$weekdayhours = $days['sunday'];
	endif;

	?>

<tr>
	<td data-title="Day"><?php echo $weekday ?></td>
	<td data-title="Open"><?php if(in_array($weekday_calc, $closed)): echo '[CLOSED]'; else: echo $weekdayhours['open']; endif; ?></td>
	<td data-title="Closing"><?php if(in_array($weekday_calc, $closed)): echo '[CLOSED]'; else: echo $weekdayhours['close']; endif; ?></td>

</tr>

<?php endforeach; ?>

</table>