/**
* {@inheritDoc}
*/
public function isOptionalExistingKey($key, array $values, $suppressException = true)
{
/* Clear the last error. */
$this->lastError = null;
/* If valid just return true. */
if (Validator::isOptionalExistingKey($key, $values)) {
return true;
}
/* Set the error message. */
$this->lastError = sprintf('Expected null or array to contain key \'%s\'.', $key);
return $this->validationFailed($suppressException);
}
