function my_admin_menu() {
add_menu_page(
__( 'Sample page', 'my-textdomain' ),
__( 'Sample menu', 'my-textdomain' ),
'manage_options',
'sample-page',
'my_admin_page_contents',
'dashicons-schedule',
3
);
}
add_action( 'admin_menu', 'my_admin_menu' );
function my_admin_page_contents() {
?>
![Custom Admin Page in WordPress](https://i0.wp.com/prafulbhuskute.com/wp-content/uploads/2021/07/Custom-Admin-Page.png?fit=786%2C704&ssl=1)