/* add an extra field to users to check if they registered */

function defunktnu_add_custom_user_profile_fields($user) {
?>
    <h3><?php _e('Extra Profile Information', 'your_textdomain'); ?></h3>
    <table class="form-table">
        <tr>
            <th>
                <label for="address"><?php _e('Address', 'your_textdomain'); ?>
            </label></th>
            <td>
                <input type="text" name="address" id="address" value="<?php echo esc_attr( get_user_meta( $user->ID, 'address', true) ); ?>" class="regular-text" /><br />
                <span class="description"><?php _e('Please enter your address.', 'your_textdomain'); ?></span>
            </td>
        </tr>
        <tr>
            <th>
                <label for="address"><?php _e('Al geregistreerd', 'your_textdomain'); ?>
            </label></th>
            <td>
                <?php
                    $checked == "";
                    if(get_user_meta( $user->ID, 'registered', true) == "Ja") {
                        $checked = " checked=\"checked\"";
                    }
                ?>
                <input type="checkbox" name="registered"<?=$checked?> id="registered" value="Ja" class="regular-text" /><br />
            </td>
        </tr>
    </table>
<?php }

function fb_save_custom_user_profile_fields( $user_id ) {
    if ( !current_user_can( 'edit_user', $user_id ) )
        return FALSE;
    //echo("*" . $_POST['registered']);exit();
    update_usermeta( $user_id, 'address', $_POST['address'] );
    update_usermeta( $user_id, 'registered', $_POST['registered'] );
}

add_action( 'show_user_profile', 'defunktnu_add_custom_user_profile_fields' );
add_action( 'edit_user_profile', 'defunktnu_add_custom_user_profile_fields' );
add_action( 'personal_options_update', 'fb_save_custom_user_profile_fields' );
add_action( 'edit_user_profile_update', 'fb_save_custom_user_profile_fields' );