Improvements to untrailingslashit() and trailingslashit(). props Jamie Talbot. fixes #3899

git-svn-id: https://develop.svn.wordpress.org/trunk@5021 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/formatting.php

@@ -563,13 +563,11 @@ function backslashit($string) {
 }
 
 function trailingslashit($string) {
-		if ( '/' != substr($string, -1))
-				$string .= '/';
-		return $string;
+	return untrailingslashit($string) . '/';
 }
 
 function untrailingslashit($string) {
-	return preg_replace('|/+$|', '', $string);
+	return rtrim($string, '/');
 }
 
 function addslashes_gpc($gpc) {