How can PHP be used to determine and apply the selected style from a user's previous visit to a website?

To determine and apply the selected style from a user's previous visit to a website, you can use cookies to store the user's preference. When the user visits the website again, you can check for the cookie value and apply the corresponding style to the website. 

<?php
// Check if a style cookie is set
if(isset($_COOKIE['style'])){
    $selected_style = $_COOKIE['style'];
    // Apply the selected style to the website
    echo '<style>body { background-color: '.$selected_style.'; }</style>';
}
?>

Keywords

PHP session management cookies user preferences styling.

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