Strip Tags Only - An implemention of the PHP strip_tags function that only removes specified tags

fn.StripTagsOnly.php

<php
/**
 * Strip Tags Only
 *
 * Just like strip_tags, but only removes the HTML tags specified and not all of
 * them.
 *
 * @param String $text The text to strip the tags from.
 * @param String|Array $allowedTags This can either be one tag (eg. 'p') or an
 *     array, (eg. ['p','br','h1']).
 * @return String The text with the mentioned tags stripped.
 * @author Aalaap Ghag <aalaap@gmail.com>
 */
function strip_tags_only($text, $allowedTags = [])
{
    if (!is_array($allowedTags)) {
        $allowedTags = [
            $allowedTags
        ];
    }
    
    array_map(
        function($allowedTag) use (&$text) {
            $regEx = '#<' . $allowedTag . '.*?>(.*?)</' . $allowedTag . '>#is';
            $text = preg_replace($regEx, '$1', $text);
        },
        $allowedTags
    );
    
    return $text;
}