What strategies can be implemented to separate HTML presentation elements from PHP logic, such as using external CSS files, to enhance code organization and development workflow in PHP projects?

To separate HTML presentation elements from PHP logic in PHP projects, one effective strategy is to use external CSS files for styling. By keeping the presentation elements in CSS files, the PHP code can focus solely on logic and data manipulation, leading to cleaner and more organized code. This separation also allows for easier maintenance and updates to the styling without affecting the underlying PHP logic.

<!DOCTYPE html>
<html>
<head>
    <link rel="stylesheet" type="text/css" href="styles.css">
</head>
<body>
    <?php
    // PHP logic here
    ?>
</body>
</html>