show or hide menu in admin panel of wordpress

Peast below code in function.php

//////////////////////////////////////
add_action('admin_menu', 'remove_menus', 102);
function remove_menus()
{
global $submenu;

remove_menu_page( 'edit.php' ); // Posts
remove_menu_page( 'upload.php' ); // Media
remove_menu_page( 'link-manager.php' ); // Links
remove_menu_page( 'edit-comments.php' ); // Comments
//remove_menu_page( 'edit.php?post_type=page' ); // Pages
remove_menu_page( 'plugins.php' ); // Plugins
//remove_menu_page( 'themes.php' ); // Appearance
remove_menu_page( 'users.php' ); // Users
remove_menu_page( 'tools.php' ); // Tools
//remove_menu_page(‘options-general.php’); // Settings

remove_submenu_page ( 'index.php', 'update-core.php' ); //Dashboard->Updates
remove_submenu_page ( 'themes.php', 'themes.php' ); // Appearance-->Themes
remove_submenu_page ( 'themes.php', 'widgets.php' ); // Appearance-->Widgets
remove_submenu_page ( 'themes.php', 'theme-editor.php' ); // Appearance-->Editor
remove_submenu_page ( 'options-general.php', 'options-general.php' ); // Settings->General
remove_submenu_page ( 'options-general.php', 'options-writing.php' ); // Settings->writing
remove_submenu_page ( 'options-general.php', 'options-reading.php' ); // Settings->Reading
remove_submenu_page ( 'options-general.php', 'options-discussion.php' ); // Settings->Discussion
remove_submenu_page ( 'options-general.php', 'options-media.php' ); // Settings->Media
remove_submenu_page ( 'options-general.php', 'options-privacy.php' ); // Settings->Privacy
}