From 70a92ca96ecf4ff2bc618f6f5d2060446b79f126 Mon Sep 17 00:00:00 2001
From: Dion Hulse <dd32@git.wordpress.org>
Date: Wed, 10 Jan 2018 02:49:49 +0000
Subject: [PATCH] Streams: When checking in `wp_is_stream()` escape the stream
 wrapper names for PCRE to avoid PHP warnings when invalid stream wrappers are
 registered.

Fixes #43054.


git-svn-id: https://develop.svn.wordpress.org/trunk@42432 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/functions.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index 9b5f292eec..320d76918e 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -5459,6 +5459,7 @@ function _device_can_upload() {
  */
 function wp_is_stream( $path ) {
 	$wrappers    = stream_get_wrappers();
+	$wrappers    = array_map( 'preg_quote', $wrappers );
 	$wrappers_re = '(' . join( '|', $wrappers ) . ')';
 
 	return preg_match( "!^$wrappers_re://!", $path ) === 1;