Symfony3克隆說不是對象

Question

我不能克隆數組集合對象，因爲它說它不是一個對象。

這是我這裏的行動：

public function editAction(Request $request, Post $post) 
{ 
    $deleteForm = $this->createDeleteForm($post); 
    $editForm = $this->createForm('AppBundle\Form\PostType', $post); 
    $editForm->handleRequest($request); 

    var_dump($post->getPostImages()); // object 
    // $original_images = clone $post->getPostImages(); says not object 
    $original_images = $post->getPostImages(); 

    if ($editForm->isSubmitted() && $editForm->isValid()) { 
     $em = $this->getDoctrine()->getManager(); 
     $postImages = $post->getPostImages(); 
     $post->setPostImages([]); 
     var_dump($original_images); // not same as 1st dump 
     die; 

     foreach ($postImages as $image) { 
      $fileName = md5(uniqid()).'.'.$image->guessExtension(); 
      if ($image->move(
      $this->container->getParameter('post_image').$post->getTitle(), 
      $fileName)) { 
       // $images[] = $fileName; 
       $post->addPostImage(array('fileName' => $fileName)); 


      } 
     } 
     $em->persist($post); 
     $em->flush(); 

     return $this->redirectToRoute('post_edit', array('id' => $post->getId())); 
    } 

    if ($this->checkAction($post)) { 
     return $this->checkAction($post); 
    } 

    return $this->render('post/edit.html.twig', array(
     'post' => $post, 
     'edit_form' => $editForm->createView(), 
     'delete_form' => $deleteForm->createView(), 
    )); 
} 

首屆VAR轉儲返回此：

object(Doctrine\Common\Collections\ArrayCollection)#380 (1) { ["elements":"Doctrine\Common\Collections\ArrayCollection":private]=> array(1) { [0]=> array(1) { ["fileName"]=> string(36) "ba2a3dd44902cc4411e6508015f026a3.png" } } } 

當我試圖克隆我得到這個對象：

Error: __clone method called on non-object 

而且第二個var轉儲返回此（在提交表單後）：

array(1) { 
    [0]=> 
    object(Symfony\Component\HttpFoundation\File\UploadedFile)#14 (7) { 
    ["test":"Symfony\Component\HttpFoundation\File\UploadedFile":private]=> 
    bool(false) 
    ["originalName":"Symfony\Component\HttpFoundation\File\UploadedFile":private]=> 
    string(34) "Screenshot_2016-06-20_14-28-36.png" 
    ["mimeType":"Symfony\Component\HttpFoundation\File\UploadedFile":private]=> 
    string(9) "image/png" 
    ["size":"Symfony\Component\HttpFoundation\File\UploadedFile":private]=> 
    int(610945) 
    ["error":"Symfony\Component\HttpFoundation\File\UploadedFile":private]=> 
    int(0) 
    ["pathName":"SplFileInfo":private]=> 
    string(14) "/tmp/phpoY3L5i" 
    ["fileName":"SplFileInfo":private]=> 
    string(9) "phpoY3L5i" 
    } 
} 

更新＃1： 表單生成器：

<?php 
namespace AppBundle\Form; 
use Symfony\Component\Form\AbstractType; 
use Symfony\Component\Form\FormBuilderInterface; 
use Symfony\Component\OptionsResolver\OptionsResolver; 
use Symfony\Component\Form\Extension\Core\Type\FileType; 
use Symfony\Component\Form\CallbackTransformer; 
class PostType extends AbstractType 
{ 
    /** 
    * @param FormBuilderInterface $builder 
    * @param array $options 
    */ 
    public function buildForm(FormBuilderInterface $builder, array $options) 
    { 
     $builder 
      ->add('title') 
      ->add('content') 
      ->add('postImages', FileType::class, array('label' => 'Post Image', 'multiple' => true, 'data_class' => 'Doctrine\Common\Collections\ArrayCollection', 'required' => false)) 
     ; 
      } 
    /** 
    * @param OptionsResolver $resolver 
    */ 
    public function configureOptions(OptionsResolver $resolver) 
    { 
     $resolver->setDefaults(array(
      'data_class' => 'AppBundle\Entity\Post' 
     )); 
    } 
} 

Answer 1

顯然移動：

$original_images = $post->getPostImages(); 

上圖：

$editForm->handleRequest($request); 

的伎倆，現在的代碼如下所示：

$deleteForm = $this->createDeleteForm($post); 
$editForm = $this->createForm('AppBundle\Form\PostType', $post); 
$original_images = $post->getPostImages(); 
$editForm->handleRequest($request);