Streams: Return early from wp_is_stream() for paths that aren't streams.

Some versions of PHP appear to have a memory leak that is occasionally triggered by calling `stream_get_wrappers()`. In order to avoid calling this, we can return early from `wp_is_stream()` when `$path` doesn't contain `://`.

Props pbiron, JPry, dontstealmyfish.
Fixes #44532.



git-svn-id: https://develop.svn.wordpress.org/trunk@43466 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/functions.php

@@ -5553,6 +5553,11 @@ function _device_can_upload() {
  * @return bool True if the path is a stream URL.
  */
 function wp_is_stream( $path ) {
+	if ( false === strpos( $path, '://' ) ) {
+		// $path isn't a stream
+		return false;
+	}
+
 	$wrappers    = stream_get_wrappers();
 	$wrappers    = array_map( 'preg_quote', $wrappers );
 	$wrappers_re = '(' . join( '|', $wrappers ) . ')';