- if (!is_callable($choices = array($this->context->getObject(), $constraint->callback))
- && !is_callable($choices = array($this->context->getClassName(), $constraint->callback))
- && !is_callable($choices = $constraint->callback)
+ if (!\is_callable($choices = array($this->context->getObject(), $constraint->callback))
+ && !\is_callable($choices = array($this->context->getClassName(), $constraint->callback))
+ && !\is_callable($choices = $constraint->callback)