util.php

<?php

// returns WordPress subdirectory if applicable
function wp_base_dir() {
  preg_match('!(https?://[^/|"]+)([^"]+)?!', site_url(), $matches);
  if (count($matches) === 3) {
    return end($matches);
  } else {
    return '';
  }
}

// opposite of built in WP functions for trailing slashes
function leadingslashit($string) {
  return '/' . unleadingslashit($string);
}

function unleadingslashit($string) {
  return ltrim($string, '/');
}

function add_filters($tags, $function) {
  foreach($tags as $tag) {
    add_filter($tag, $function);
  }
}