GP Auto Login: Auto-login based off of field/input having a value or being checked.

gpal-conditional-auto-login.php

<?php
/**
 * See https://gravitywiz.com/documentation/how-do-i-install-a-snippet/ for details on how to install snippets like these.
 *
 * Note: This snippet requires GP Auto Login 1.3.5 or newer.
 *
 * The following snippet allows you to conditionally auto-login based on whether or not a field has a value
 * or is checked.
 *
 * $form_id should be replaced with the form ID you wish to apply the login to.
 *
 * $input_id should be replaced with the field or input ID that you wish to check. The login below checks if the
 * field/input is checked or has a value.
 */
add_filter( 'gpal_auto_login', function ( $auto_login, $user_id, $feed, $entry ) {

    $form_id = 47;
    $input_id = '4.1';

    if ( rgar( $entry, 'form_id' ) != $form_id ) {
        return $auto_login;
    }

    if ( ! rgar( $entry, $input_id ) ) {
        return false;
    }

    return $auto_login;

}, 10, 4 );