What are some common mistakes users make when configuring PHP admin menus?

One common mistake users make when configuring PHP admin menus is not properly registering the menu page with the correct hook. To solve this issue, make sure to use the `add_menu_page()` or `add_submenu_page()` function within the `admin_menu` action hook.

// Correct way to register admin menu page
function my_admin_menu() {
    add_menu_page( 'My Admin Page', 'My Admin Page', 'manage_options', 'my-admin-page', 'my_admin_page_callback' );
}
add_action( 'admin_menu', 'my_admin_menu' );

function my_admin_page_callback() {
    // Add your admin page content here
}