I18N: Do not reuse $theme variable name after loading a theme's functions.php file.

The file could declare its own `$theme` variable, which would override the one used in the `foreach` loop.

To prevent this, call `wp_get_theme()` before loading the file and store the instance in a different variable.

Props neo2k23, swissspidy.
See #62244.

git-svn-id: https://develop.svn.wordpress.org/trunk@59466 602fd350-edb4-49c9-b593-d223f7449a82

Author: swissspidy

src/wp-settings.php

@@ -679,14 +679,15 @@
 
 // Load the functions for the active theme, for both parent and child theme if applicable.
 foreach ( wp_get_active_and_valid_themes() as $theme ) {
+	$wp_theme = wp_get_theme( basename( $theme ) );
+
 	if ( file_exists( $theme . '/functions.php' ) ) {
 		include $theme . '/functions.php';
 	}
 
-	$theme = wp_get_theme( basename( $theme ) );
-	$theme->load_textdomain();
+	$wp_theme->load_textdomain();
 }
-unset( $theme );
+unset( $theme, $wp_theme );
 
 /**
  * Fires after the theme is loaded.