WordPress Snippets at WPcustoms

Disable HTML in comments

What this does is it converts single quotes, double quotes, the less than symbol (<), the greater than symbol (>), and ampersands (&) to HTML entities whenever a comment is posted, so that they are displayed as-is when someone views the comment.


/**
 * Snippet Name: Disable HTML in comments
 * Snippet URL: http://www.wpcustoms.net/snippets/disable-html-comments/
 */
 // This will occur when the comment is posted
function plc_comment_post( $incoming_comment ) {

	// convert everything in a comment to display literally
	$incoming_comment['comment_content'] = htmlspecialchars($incoming_comment['comment_content']);

	// the one exception is single quotes, which cannot be #039; because WordPress marks it as spam
	$incoming_comment['comment_content'] = str_replace( "'", ''', $incoming_comment['comment_content'] );

	return( $incoming_comment );
}

// This will occur before a comment is displayed
function plc_comment_display( $comment_to_display ) {

	// Put the single quotes back in
	$comment_to_display = str_replace( ''', "'", $comment_to_display );

	return $comment_to_display;
}

add_filter( 'preprocess_comment', 'plc_comment_post', '', 1 );
add_filter( 'comment_text', 'plc_comment_display', '', 1 );
add_filter( 'comment_text_rss', 'plc_comment_display', '', 1 );
add_filter( 'comment_excerpt', 'plc_comment_display', '', 1 );
// This stops WordPress from trying to automatically make hyperlinks on text:
remove_filter( 'comment_text', 'make_clickable', 9 );