do_allowed_shortcodes to allow processing of limited list of shortcodes

[beezeee]

We have a front facing content editor and want to enable our users to use a specific set of shortcodes, without exposing all of the sites shortcodes to them.

Here's the function we use for this. It is passed an array of allowed shortcodes, and any other shortcodes are stripped from the content.

function do_allowed_shortcodes($content, $shortcodes=array())
{
    //if no allowed shortcodes are provided, strip all shortcodes and return content
	if (empty($shortcodes))
	{
		return(strip_shortcodes($content));
	}
    //foreach allowed shortcode provided, build the necessary regex to temporarily change [shortcode] to {shortcode} and then back
	foreach ($shortcodes as $shortcode)
	{
		$allowed_matches[] = '/\[('.$shortcode.'[^\]]*)\]/';
		$restore_allowed_matches[] = '/\{('.$shortcode.'[^\}]*)\}/';
	}
    //change safe shortcodes from [shortcode] to {shortcode}
	$safe_content = preg_replace($allowed_matches, '{$1}', $content);
    //strip remaining [shortcodes]
	strip_shortcodes($safe_content);
    //change {shortcodes} back to [shortcodes] and return result of do_shortcode() on that content
	$trimmed_content = preg_replace($restore_allowed_matches, '[$1]', $safe_content);
	return do_shortcode($trimmed_content);
}

Seems like this would be a nice addition to core functionality.

realized there was a typo, here's the correct code

function do_allowed_shortcodes($content, $shortcodes=array())
{
    //if no allowed shortcodes are provided, strip all shortcodes and return content
	if (empty($shortcodes))
	{
		return(strip_shortcodes($content));
	}
    //foreach allowed shortcode provided, build the necessary regex to temporarily change [shortcode] to {shortcode} and then back
	foreach ($shortcodes as $shortcode)
	{
		$allowed_matches[] = '/\[('.$shortcode.'[^\]]*)\]/';
		$restore_allowed_matches[] = '/\{('.$shortcode.'[^\}]*)\}/';
	}
    //change safe shortcodes from [shortcode] to {shortcode}
	$safe_content = preg_replace($allowed_matches, '{$1}', $content);
    //strip remaining [shortcodes]
	$clean_content = strip_shortcodes($safe_content);
    //change {shortcodes} back to [shortcodes] and return result of do_shortcode() on that content
	$trimmed_content = preg_replace($restore_allowed_matches, '[$1]', $clean_content);
	return do_shortcode($trimmed_content);
}