Lift initial empty assignment of $srcs and $ids to outer block loop.

Author: dmsnell

src/wp-includes/media.php

@@ -5310,6 +5310,8 @@ function get_post_galleries( $post, $html = true, $max_galleries = PHP_INT_MAX )
 		$gallery_depth    = $processor->get_depth();
 		$has_inner_blocks = false;
 		$gallery_ids      = $processor->allocate_and_return_parsed_attributes()['attrs']['ids'] ?? array();
+		$ids              = array();
+		$srcs             = array();
 
 		$html_chunks = array();
 		$top_chunks  = array();
@@ -5345,8 +5347,6 @@ function get_post_galleries( $post, $html = true, $max_galleries = PHP_INT_MAX )
 		// New Gallery block format as an array.
 		if ( $has_inner_blocks ) {
 			// There are inner blocks and this is the first one; the loop above aborted at its opening.
-			$ids  = array();
-			$srcs = array();
 
 			/**
 			 * @todo Could avoid computation by tracking seen ids and only looking up the