使用PHP if语句添加CSS?

I have an if statement which shows a countdown only on Sundays and Wednesdays. But, I need to add padding to the body as well for it to display correctly.

So basically I need to add padding to the body when a line of php is executed.

Is this possible?

To keep your styles and HTML separate, you can add a class to the body based on the same if statement. Then use your CSS to add styles to that class:

<?php 
$dayOfWeek = date( "w", $timestamp);
if ($dayOfWeek == 0 || $dayOfWeek == 3) { ?>
    <body class="withCountdown">
<?php } else { ?>
    <body>
<?php } ?>

body.withCountdown {
    padding: 10px;
}

(Excuse my rusty PHP syntax!)

<body style="padding:<?php echo(is_sunday() ? '4px' : '0' );?>" >