WordPress script and style cache busting!

cache-busting-script.php

add_action('wp_enqueue_scripts', 'load_your_css');
function load_your_css(){
	if(!is_admin()){
		$css_link = get_stylesheet_directory_uri() . '/style.css';
		$css_file = get_stylesheet_directory() . '/style.css';
		wp_enqueue_style('theme-style', $css_link, array(), filemtime($css_file), 'all');
	}
}