What is the purpose of the function "cssversion" in the PHP code provided?

The purpose of the function "cssversion" in the PHP code provided is to append a version number to the CSS file path in order to force browsers to fetch the latest version of the CSS file when it has been updated. This helps in avoiding caching issues where the browser may serve an outdated version of the CSS file. 

function cssversion($file) {
    return $file . '?v=' . filemtime($_SERVER['DOCUMENT_ROOT'] . $file);
}

// Example usage
$css_file = 'styles.css';
$css_file_with_version = cssversion($css_file);
echo '<link rel="stylesheet" type="text/css" href="' . $css_file_with_version . '">';

Keywords

PHP function cssversion code purpose

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