Are there any best practices for efficiently managing large CSS files with PHP variables?

When managing large CSS files with PHP variables, it's important to organize your code effectively to maintain readability and efficiency. One best practice is to separate your CSS styles into different files based on their purpose or sections. You can then use PHP to dynamically include these files and replace variables as needed.

<?php
$primaryColor = '#ff0000';
$secondaryColor = '#00ff00';
?>

/* styles.css */
body {
    background-color: <?php echo $primaryColor; ?>;
    color: <?php echo $secondaryColor; ?>;
}

/* header.css */
.header {
    background-color: <?php echo $primaryColor; ?>;
    color: <?php echo $secondaryColor; ?>;
}

/* index.php */
<!DOCTYPE html>
<html>
<head>
    <link rel="stylesheet" type="text/css" href="styles.css">
    <link rel="stylesheet" type="text/css" href="header.css">
</head>
<body>
    <div class="header">Header</div>
</body>
</html>