Ticket #48599: 48599.3.diff

src/wp-admin/includes/plugin.php

@@ -1390 +1390 @@
 
                 $submenu[ $parent_slug ][] = $new_sub_menu;
         } else {
-                // If position is equal or higher than the number of items in the array, append the submenu.
-                if ( $position >= count( $submenu[ $parent_slug ] ) ) {
+                // If the parent item isn't present in the submenu or, if position is equal or higher than the number of items in the array, append the submenu.
+                if ( ! isset( $submenu[ $parent_slug ] ) || $position >= count( $submenu[ $parent_slug ] ) ) {
                         $submenu[ $parent_slug ][] = $new_sub_menu;
                 } else {
                         // Test for a negative position.

tests/phpunit/tests/admin/includesPlugin.php

@@ -255 +255 @@
                 );
         }
 
+        /**
+         * Test that when a submenu has the same slug as a parent item, that it's just appended and ignores the priority.
+         *
+         * @ticket 48599
+         */
+        function test_priority_when_parent_slug_child_slug_are_the_same() {
+                global $submenu, $menu;
+
+                // Reset menus.
+                $submenu      = array();
+                $menu         = array();
+                $current_user = get_current_user_id();
+                $admin_user   = self::factory()->user->create( array( 'role' => 'administrator' ) );
+                wp_set_current_user( $admin_user );
+                set_current_screen( 'dashboard' );
+
+                // Setup a menu with some items.
+                add_menu_page( 'Main Menu', 'Main Menu', 'manage_options', 'main_slug', 'main_page_callback' );
+                add_submenu_page( 'main_slug', 'SubMenu 1', 'SubMenu 1', 'manage_options', 'main_slug', 'submenu_callback_1', 1 );
+                add_submenu_page( 'main_slug', 'SubMenu 2', 'SubMenu 2', 'manage_options', 'submenu_page2', 'submenu_callback_2', 2 );
+                add_submenu_page( 'main_slug', 'SubMenu 3', 'SubMenu 3', 'manage_options', 'submenu_page3', 'submenu_callback_3', 3 );
+
+                // Clean up the temporary user.
+                wp_set_current_user( $current_user );
+                wp_delete_user( $admin_user );
+
+                // Verify the menu was inserted at the expected position.
+                $this->assertSame( 'main_slug', $submenu['main_slug'][0][2] );
+                $this->assertSame( 'submenu_page2', $submenu['main_slug'][1][2] );
+                $this->assertSame( 'submenu_page3', $submenu['main_slug'][2][2] );
+        }
+
+        /**
+         * Passing a string as priority will fail.
+         *
+         * @ticket 48599
+         */
+        function test_passing_string_as_priority_fires_doing_it_wrong() {
+                $this->setExpectedIncorrectUsage( 'add_submenu_page' );
+                global $submenu, $menu;
+
+                // Reset menus.
+                $submenu      = array();
+                $menu         = array();
+                $current_user = get_current_user_id();
+                $admin_user   = self::factory()->user->create( array( 'role' => 'administrator' ) );
+                wp_set_current_user( $admin_user );
+                set_current_screen( 'dashboard' );
+
+                // Setup a menu with some items.
+                add_menu_page( 'Main Menu', 'Main Menu', 'manage_options', 'main_slug', 'main_page_callback' );
+                add_submenu_page( 'main_slug', 'SubMenu 1', 'SubMenu 1', 'manage_options', 'submenu_page_1', 'submenu_callback_1', '2' );
+
+                // Clean up the temporary user.
+                wp_set_current_user( $current_user );
+                wp_delete_user( $admin_user );
+
+                // Verify the menu was inserted at the expected position.
+                $this->assertSame( 'submenu_page_1', $submenu['main_slug'][1][2] );
+        }
+
         function test_is_plugin_active_true() {
                 activate_plugin( 'hello.php' );
                 $test = is_plugin_active( 'hello.php' );