From d2e0a1c81a4fb10a2281d38ac6c7d435a3077ac8 Mon Sep 17 00:00:00 2001
From: Ryan Boren <ryan@git.wordpress.org>
Date: Sun, 21 Nov 2004 06:03:19 +0000
Subject: [PATCH] Allow empty uris to be passed to add_query_arg().  Useful
 when appending arguments to WP_Query query strings that do not yet have any
 arguments.

git-svn-id: https://develop.svn.wordpress.org/trunk@1872 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-includes/functions.php | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 93fe485c19..341af830c3 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -2348,11 +2348,13 @@ function add_query_arg() {
 		$uri = @func_get_arg(1);
 	}
 	else {
-		$uri = @func_get_arg(2);
-	}
-	if ('' == $uri) {
-		$uri = $_SERVER['REQUEST_URI'];
+		if (@func_num_args() < 3) {
+			$uri = $_SERVER['REQUEST_URI'];
+		} else {
+			$uri = @func_get_arg(2);
+		}
 	}
+
 	if (strstr($uri, '?')) {
 		$parts = explode('?', $uri, 2);
 		if (1 == count($parts)) {