shortcode実行結果の前後に勝手に入る p タグを消す

<?php
add_filter('the_content', 'shortcode_p_fix');
function shortcode_p_fix($content){
  $p = array (
    '<p>[' => '[',
    ']</p>' => ']',
    ']<br />' => ']'
  );
  $content = strtr($content, $p);
  return $content;
}