/**
* Validates either a single field or the whole command against
* the validation rules that are enforceable on the PHP side -
* type rules, ranges, four-digit dates, etc. Rules such as unique
* or existing, or validation by calculation field, cannot be
* pre-validated.
*
* If the optional $fieldName argument is passed, only that field
* will be validated. Otherwise the command will be validated just
* as if execute() were called with prevalidation turned on in the
* API properties. validate() returns TRUE if validation passes,
* or a FileMaker_Error_Validation object containing details about
* what failed to validate.
*
* @param string $fieldName Only validate this field. If empty, validate the whole record.
* @return boolean|FileMaker_Error_Validation Result of field validation on $value.
*/
function validate($fieldName = null)
{
return $this->_impl->validate($fieldName);
}
