update user meta using select (wordpress)

user-meta-select.php

<?php
// source: https://stackoverflow.com/questions/24960820/wordpress-update-user-meta-using-select/24962153#24962153


add_action( 'show_user_profile', 'my_show_extra_profile_fields' );
add_action( 'edit_user_profile', 'my_show_extra_profile_fields' );

function my_show_extra_profile_fields( $user ) {

    $hub_group = get_user_meta( $user->ID, 'hub_group' );

    ?>

    <h3>Extra profile information</h3>
    <table class="form-table">
        <tr>
            <th><label for="twitter">PfAL Group</label></th>
            <td>
                <select name="hub_group" id="hub_group">
                  <option value="PfAL 1" <?php selected( $hub_group[0], "PfAL 1" ); ?>>PfAL 1</option>
                  <option value="PfAL 2" <?php selected( $hub_group[0], "PfAL 2" ); ?>>PfAL 2</option>
                  <option value="PfAL 3" <?php selected( $hub_group[0], "PfAL 3" ); ?>>PfAL 3</option>
                  <option value="PfAL 4" <?php selected( $hub_group[0], "PfAL 4" ); ?>>PfAL 4</option>
                </select>
            </td>
        </tr>
    </table>

    <?php 

}

add_action( 'personal_options_update', 'save_extra_user_profile_fields' );
add_action( 'edit_user_profile_update', 'save_extra_user_profile_fields' );

function save_extra_user_profile_fields( $user_id ) {

    if ( !current_user_can( 'edit_user', $user_id ) ) { return false; }

    update_user_meta( $user_id, 'hub_group', $_POST['hub_group'] );

}