user id wordpress code example

Example 1: from user id to user role wordpress

$user_meta = get_userdata( $user_id );

$user_roles = $user_meta->roles; // array with all the roles the user is part of.

Example 2: how to display user id from a function on a wordpress page

function get_current_user_id() {
    if ( ! function_exists( 'wp_get_current_user' ) ) {
        return 0;
    }
    $user = wp_get_current_user();
    return ( isset( $user->ID ) ? (int) $user->ID : 0 );
}