PHP: Regex alternative to array_intersect

Question

I'm using a method that takes an array of words and removes any that don't match the following:

return is_array( $var ) ? array_intersect( $var,
    array(
        'current_page_item',
        'current-menu-item',
        'current_page_parent',
        'current_page_ancestor',
        'current-menu-ancestor',
        'first',
        'last',
        'vertical',
        'horizontal'
    )
) : '';

How can I modify this so that I can include li(?:-[a-z_-]+)?? (Examples: li, li-align_left, li-magnify)

Answer 1

You could use array_filter to achieve this:

return is_array( $var ) ? array_filter($var, function($ele) {
  return preg_match('/li(?:-[a-z_-]+)?/', $ele);
}) : '';