Symfony\Component\Form\FormBuilder::remove PHP Method

    public function remove($name)
    {
        if ($this->locked) {
            throw new FormException('The form builder cannot be modified anymore.');
        }

        unset($this->unresolvedChildren[$name]);

        if (array_key_exists($name, $this->children)) {
            if ($this->children[$name] instanceof self) {
                $this->children[$name]->setParent(null);
            }
            unset($this->children[$name]);
        }

        return $this;
    }