Hash Cache

gistfile1.txt

function my_load_meta() {
  $script = '/js/script.js';
  wp_enqueue_script( 'my-tools', get_template_directory_uri().$script, null, my_version_hash($script) );
  $stylesheet = '/style.css';
  wp_enqueue_style( 'my-style', get_template_directory_uri().$stylesheet, null, my_version_hash($stylesheet) );
}
add_action('wp_enqueue_scripts', 'my_load_meta');

// Create a hash of the file and pass it back for caching purposes
function my_version_hash($file) {
  if(!$file) return false;
  $full_path = get_template_directory() . $file;
  return hash_file('CRC32',$full_path);
}