Add custom columns to the user table of the admin dashbord

functions.php

<?php /**
 * Adds a custom column to the user display dashboard.
 *
 * @param   $columns    The array of columns that are displayed on the user dashboard
 * @return          The updated array of columns now including zip codes.
 */
function new_modify_user_table( $column ) {
    $column['register_phone'] = 'Phone';
    $column['zip_code'] = 'Zip';
    return $column;
}
add_filter( 'manage_users_columns', 'new_modify_user_table' );

function new_modify_user_table_row( $val, $column_name, $user_id ) {
    switch ($column_name) {
        case 'register_phone' :
            return get_the_author_meta( 'register_phone', $user_id );
            break;
        case 'zip_code' :
            return get_the_author_meta( 'zip_code', $user_id );;
            break;
        default:
    }
    return $val;
}
add_filter( 'manage_users_custom_column', 'new_modify_user_table_row', 10, 3 );
?>