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<?php
/**
 * Gravity Wiz // Gravity Forms // User-specific Upload Paths
 *
 * Modifies the default Gravity Forms file upload path to user-specific (based on the user login) upload paths.
 * If the user's login were "john315", the upload path would be ".../wp-content/uploads/john315/".
 * If the user is not logged in, the default GF upload path will be used.
 *
 * @version	 1.0
 * @author    David Smith <david@gravitywiz.com>
 * @license   GPL-2.0+
 * @link      http://gravitywiz.com/...
 */
add_filter( 'gform_upload_path', 'gw_user_specific_upload_path' );
function gw_user_specific_upload_path( $upload_path ) {

    if( ! is_user_logged_in() ) {
        return $upload_path;
    }

    $user = wp_get_current_user();
    $username = $user->get( 'user_login' );

    $upload_dir = wp_upload_dir();
    $user_dir = $upload_dir['basedir'] . "/{$username}/";
    $user_url = $upload_dir['baseurl'] . "/{$username}/";

    return array(
        'path' => $user_dir,
        'url'  => $user_url
    );
}