Code Modernisation: Introduce the spread operator in `wp-includes/functions.php`.

Rather than relying `func_get_args()` to retrieve arbitrary function arguments, we can now use the spread operator to assign them directly to a variable.

Props jrf.
See #47678.
Built from https://develop.svn.wordpress.org/trunk@46126


git-svn-id: http://core.svn.wordpress.org/trunk@45938 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions.php

@@ -1040,8 +1040,7 @@ function _http_build_query( $data, $prefix = null, $sep = null, $key = '', $urle
  * @param string       $url   Optional. A URL to act upon.
  * @return string New URL query string (unescaped).
  */
-function add_query_arg() {
-	$args = func_get_args();
+function add_query_arg( ...$args ) {
 	if ( is_array( $args[0] ) ) {
 		if ( count( $args ) < 2 || false === $args[1] ) {
 			$uri = $_SERVER['REQUEST_URI'];

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-46125';
+$wp_version = '5.3-alpha-46126';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.