What are the best practices for adjusting website layout based on screen width in PHP?

When adjusting website layout based on screen width in PHP, it is essential to use responsive design techniques to ensure that your website looks good on all devices. One common approach is to use CSS media queries to define different styles for different screen sizes. By using PHP to dynamically generate CSS styles based on the screen width, you can create a more flexible and adaptive layout.

<?php
echo '<style>';
echo '@media screen and (max-width: 600px) {';
echo '  /* CSS styles for screens smaller than 600px */';
echo '}';
echo '@media screen and (min-width: 601px) {';
echo '  /* CSS styles for screens larger than 600px */';
echo '}';
echo '</style>';
?>