AlreadySubmittedException example

return true;
    }

    public function setParent(FormInterface $parent = null): static
    {
        if (1 > \func_num_args()) {
            trigger_deprecation('symfony/form', '6.2', 'Calling "%s()" without any arguments is deprecated, pass null explicitly instead.', __METHOD__);
        }

        if ($this->submitted) {
            throw new AlreadySubmittedException('You cannot set the parent of a submitted form.');
        }

        if (null !== $parent && '' === $this->name) {
            throw new LogicException('A form with an empty name cannot have a parent form.');
        }

        $this->parent = $parent;

        return $this;
    }

    

public function offsetUnset(mixed $offset): void
    {
        throw new BadMethodCallException('Buttons cannot have children.');
    }

    public function setParent(FormInterface $parent = null): static
    {
        if (1 > \func_num_args()) {
            trigger_deprecation('symfony/form', '6.2', 'Calling "%s()" without any arguments is deprecated, pass null explicitly instead.', __METHOD__);
        }
        if ($this->submitted) {
            throw new AlreadySubmittedException('You cannot set the parent of a submitted button.');
        }

        $this->parent = $parent;

        return $this;
    }

    public function getParent(): ?FormInterface
    {
        return $this->parent;
    }