How to load WordPress assets and append last modified time so the browser loads them only when necessary.

load-assets.php

// the vhost has this line to define the environment 'SetEnv DEV_ENV development'
$suffix = empty($_SERVER['DEV_ENV']) ? '.min' : '';

wp_register_style('my-awesome-plugin', plugins_url("/assets/main{$suffix}.css", __FILE__), false,
	filemtime( plugin_dir_path( __FILE__ ) . "/assets/main{$suffix}.css" ) );
wp_enqueue_style('my-awesome-plugin');

wp_enqueue_script( 'jquery' );
wp_register_script( 'my-awesome-plugin', plugins_url("/assets/main{$suffix}.js", __FILE__), array('jquery', ),
		filemtime( plugin_dir_path( __FILE__ ) . "/assets/main{$suffix}.js" ), true);
wp_enqueue_script( 'my-awesome-plugin' );