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.

Built from https://develop.svn.wordpress.org/trunk@42432


git-svn-id: http://core.svn.wordpress.org/trunk@42262 1a063a9b-81f0-0310-95a4-ce76da25c4cd

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;

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-42431';
+$wp_version = '5.0-alpha-42432';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.