Symfony\Component\Form\Form::bind PHP Method

    public function bind($clientData)
    {
        if ($this->readOnly) {
            $this->bound = true;

            return $this;
        }

        if (is_scalar($clientData) || null === $clientData) {
            $clientData = (string) $clientData;
        }

        // Initialize errors in the very beginning so that we don't lose any
        // errors added during listeners
        $this->errors = array();

        $event = new DataEvent($this, $clientData);
        $this->dispatcher->dispatch(FormEvents::PRE_BIND, $event);

        $appData = null;
        $normData = null;
        $extraData = array();
        $synchronized = false;

        // Hook to change content of the data bound by the browser
        $event = new FilterDataEvent($this, $clientData);
        $this->dispatcher->dispatch(FormEvents::BIND_CLIENT_DATA, $event);
        $clientData = $event->getData();

        if (count($this->children) > 0) {
            if (null === $clientData || '' === $clientData) {
                $clientData = array();
            }

            if (!is_array($clientData)) {
                throw new UnexpectedTypeException($clientData, 'array');
            }

            foreach ($this->children as $name => $child) {
                if (!isset($clientData[$name])) {
                    $clientData[$name] = null;
                }
            }

            foreach ($clientData as $name => $value) {
                if ($this->has($name)) {
                    $this->children[$name]->bind($value);
                } else {
                    $extraData[$name] = $value;
                }
            }

            // If we have a data mapper, use old client data and merge
            // data from the children into it later
            if ($this->dataMapper) {
                $clientData = $this->getClientData();
            }
        }

        if (null === $clientData || '' === $clientData) {
            $clientData = $this->emptyData;

            if ($clientData instanceof \Closure) {
                $clientData = $clientData($this);
            }
        }

        // Merge form data from children into existing client data
        if (count($this->children) > 0 && $this->dataMapper) {
            $this->dataMapper->mapFormsToData($this->children, $clientData);
        }

        try {
            // Normalize data to unified representation
            $normData = $this->clientToNorm($clientData);
            $synchronized = true;
        } catch (TransformationFailedException $e) {
        }

        if ($synchronized) {
            // Hook to change content of the data in the normalized
            // representation
            $event = new FilterDataEvent($this, $normData);
            $this->dispatcher->dispatch(FormEvents::BIND_NORM_DATA, $event);
            $normData = $event->getData();

            // Synchronize representations - must not change the content!
            $appData = $this->normToApp($normData);
            $clientData = $this->normToClient($normData);
        }

        $this->bound = true;
        $this->appData = $appData;
        $this->normData = $normData;
        $this->clientData = $clientData;
        $this->extraData = $extraData;
        $this->synchronized = $synchronized;

        $event = new DataEvent($this, $clientData);
        $this->dispatcher->dispatch(FormEvents::POST_BIND, $event);

        foreach ($this->validators as $validator) {
            $validator->validate($this);
        }

        return $this;
    }

 /**
  * @param Request $request
  */
 public function bindRequest(Request $request)
 {
     $this->form->bind($request);
     foreach ($this->tabs as $tab) {
         $tab->bindRequest($request);
     }
 }