how to add menu in wordpress code example

Example 1: how make custom menu in wordpress

function wpb_custom_new_menu() {
  register_nav_menus(
    array(
      'my-custom-menu' => __( 'My Custom Menu' ),
      'extra-menu' => __( 'Extra Menu' )
    )
  );
}
add_action( 'init', 'wpb_custom_new_menu' );

Example 2: how make custom menu in wordpress

<?php
wp_nav_menu( array( 
    'theme_location' => 'my-custom-menu', 
    'container_class' => 'custom-menu-class' ) ); 
?>

Example 3: add top menu bar in wordpress

function register_my_menu() {
register_nav_menu('additional-menu',__( 'Additional Menu' ));
}
add_action( 'init', 'register_my_menu' );

Example 4: create menu in wordpress

function wpb_custom_new_menu() {
  register_nav_menus(
    array(
      'my-custom-menu' => __( 'My Custom Menu' ),
      'extra-menu' => __( 'Extra Menu' )
    )
  );
}
add_action( 'init', 'wpb_custom_new_menu' );
<?php
wp_nav_menu( array( 
    'theme_location' => 'my-custom-menu', 
    'container_class' => 'custom-menu-class' ) ); 
?>

Example 5: how add administration menu in wordpress

<?php
/** Step 2 (from text above). */
add_action( 'admin_menu', 'my_menu' );
 
/** Step 1. */
function my_menu() {
    add_options_page(  //this code Add submenu page to the Settings main menu
        'My Options',
        'My Menu',       //this paramenter display menu option in administration setting 
        'manage_options',
        'my-unique-identifier',
        'my_options'
    );
}
 
/** Step 3. */
function my_options() {
    if ( !current_user_can( 'manage_options' ) ) {
        wp_die( __( 'You do not have sufficient permissions to access this page.' ) );
    }
    echo 'Here is where I output the HTML for my screen.';
    echo '</div><pre>';
}
?>