require_once 'CRM/Core/BAO/Contact.php'; $fields = CRM_Contact_BAO_Contact::importableFields(); print_r($fields);This will output an array of all the available fields for the contact object that can be used for importing data. Overall, the CRM_Contact_BAO_Contact importableFields is a useful feature of the CiviCRM package in PHP that provides developers with an efficient way to retrieve all the available fields for a contact object.