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* @license GNU General Public License version 2 or later; see LICENSE.txt */ namespace Joomla\CMS\Form\Rule; \defined('JPATH_PLATFORM') or die; use Joomla\CMS\Factory; use Joomla\CMS\Form\Form; use Joomla\CMS\Form\FormRule; use Joomla\Database\ParameterType; use Joomla\Registry\Registry; /** * Form Rule class for the Joomla Platform. * * @since 4.0.0 */ class UserIdRule extends FormRule { /** * Method to test the validity of a Joomla User. * * @param \SimpleXMLElement $element The SimpleXMLElement object representing the `
` tag for the form field object. * @param mixed $value The form field value to validate. * @param ?string $group The field name group control value. This acts as an array container for the field. * For example if the field has name="foo" and the group value is set to "bar" then the * full field name would end up being "bar[foo]". * @param ?Registry $input An optional Registry object with the entire data set to validate against the entire form. * @param ?Form $form The form object for which the field is being tested. * * @return boolean True if the value is valid, false otherwise. * * @since 4.0.0 */ public function test(\SimpleXMLElement $element, $value, $group = null, Registry $input = null, Form $form = null) { // Check if the field is required. $required = ((string) $element['required'] === 'true' || (string) $element['required'] === 'required'); // If the value is empty, null or has the value 0 and the field is not required return true else return false if (($value === '' || $value === null || (string) $value === '0')) { return !$required; } // Get the database object and a new query object. $db = Factory::getDbo(); $query = $db->getQuery(true); // Build the query. $query->select('COUNT(*)') ->from($db->quoteName('#__users')) ->where($db->quoteName('id') . ' = :userId') ->bind(':userId', $value, ParameterType::INTEGER); // Set and query the database. return (bool) $db->setQuery($query)->loadResult(); } }