Automatic versioning with WordPress CSS and JS files (avoid hard refresh problems)

theme-scripts.php

<?php

  //When registering styles and scripts in WordPress, you can specify a 'version' parameter which is appended to the file's URL.
  //This is fine, but it's inconvenient having to bump the version number whenever you make a change. So why not do it automatically?

  //Note we use get_stylesheet_directory() instead of get_stylesheet_directory_uri(), so we get an absolute file path for filemtime()
  $mtime = filemtime(get_stylesheet_directory() .'/js/script.js');
  wp_register_script( 'theme-js', get_stylesheet_directory_uri() .'/js/script.js', array( 'jquery' ), $mtime, true );
  wp_enqueue_script( 'theme-js' );

  $mtime = filemtime(get_stylesheet_directory() . '/css/icon-styles.css');
  wp_register_style( 'icons', get_stylesheet_directory_uri() . '/css/icon-styles.css', array(), $mtime );
  wp_enqueue_style( 'icons' );


?>