How to add more fields to bbPress registration form

This is completely untested as I don’t use bbPress or have a copy on hand to try out for myself, but this page seems to have some code that allows you to add new registration fields.

<?php
/*
Plugin Name: Customize User Profile
*/

add_filter( 'get_profile_info_keys', 'customize_user_profile', 10, 2 );

function customize_user_profile( $fields, $context ) {
    /**
     * Remove undesired fields
     *
     * Commented =   left
     * Uncommented = removed
     */
//  unset( $fields['first_name'] );
//  unset( $fields['last_name'] );
    unset( $fields['user_url'] );
//  unset( $fields['from'] );
    unset( $fields['occ'] );
    unset( $fields['interest'] );

    /**
     * Add new fields
     *
     * Quoting functions.bb-core.php, line 906:
     * meta_key < (required?, Label, hCard property).  Don't use user_{anything} as the name of your meta_key.
     */
    $fields['my_meta_key'] = array(
        false,
        __( 'My meta key' ),
        'text'
    );

    return $fields;
}

Note: Edit is a copy/paste from the linked source.

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