allow wordfilters to be callbacks

inc/functions.php

@@ -1415,7 +1415,10 @@ function wordfilters(&$body) {
 
 	foreach ($config['wordfilters'] as $filter) {
 		if (isset($filter[2]) && $filter[2]) {
-			$body = preg_replace($filter[0], $filter[1], $body);
+			if (is_callable($filter[1]))
+				$body = preg_replace_callback($filter[0], $filter[1], $body);
+			else
+				$body = preg_replace($filter[0], $filter[1], $body);
 		} else {
 			$body = str_ireplace($filter[0], $filter[1], $body);
 		}