"codeguy/upload": "*"

composer update

<?php
/**
 * @author Sun
 * By blogs.zmit.cn http://blogs.zmit.cn
 * 原創作品,允許轉載,轉載時請務必以超鏈接形式標明文章原始出處 http://blogs.zmit.cn/6544.html
 * 中夢博客,作者信息和本聲明.否則將追究法律責任.
 */
namespace ZM\AdminBundle\Controller;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\Filesystem\Filesystem;
class DefaultController extends Controller {
  public function indexAction($name) {
    return $this->render('ZMAdminBundle:Default:index.html.twig', array('name' => $name));
  }
  /**
   * 上傳圖片
   *
   * @param type $user_id 用戶的id,用作文件名
   * @param type $str   表單中file類型的input的name
   * @param type $path  保存路徑
   * @return type
   */
  public function uploadPic($user_id, $str, $path) {
    $fs = new Filesystem();
    //檢查路徑是否存在
    if (!$fs->exists($path)) {
      //如果不存在,創建目錄
      $fs->mkdir($path, 0700);
    }
    //使用Upload庫
    $storage = new \Upload\Storage\FileSystem($path);
    $file = new \Upload\File($str, $storage);
    //如果文件名為空
    if ($file->getName() != '') {
      //設置文件名為用戶的id
      $file->setName($user_id);
      //驗證文件上傳
      $file->addValidations(array(
        //指定文件類型
        new \Upload\Validation\Mimetype(array('image/png', 'image/jpg', 'image/jpeg', 'image/gif')),
        //指定文件大小
        new \Upload\Validation\Size('2M')
      ));
      //上傳文件
      try {
        //成功
        $file->upload();
        //文件名和擴展名
        $file_name = $file->getNameWithExtension();
      } catch (\Exception $e) {
        //失敗!
        $errors = $file->getErrors();
      }
    }
    //返回文件名和擴展名
    return $file_name;
  }
}

<?php
/**
 * 聯系人控制器
 * @author Sun
 * By blogs.zmit.cn http://blogs.zmit.cn
 * 原創作品,允許轉載,轉載時請務必以超鏈接形式標明文章原始出處 http://blogs.zmit.cn/6544.html
 * 中夢博客,作者信息和本聲明.否則將追究法律責任.
 */
namespace ZM\ApiBundle\Controller;
//引用寫好的上傳圖片辦法uploadPic的Controller,并命名為BaseController
use ZM\AdminBundle\Controller\DefaultController AS BaseController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
//繼承BaseController
class ContactController extends BaseController {
  /**
   * 用戶上傳頭像
   *
   * @return Response
   */
  public function uploadHeadAction() {
    $request = Request::createFromGlobals()->request;
    $user_id = $request->get('user_id');
    //判斷是否有文件上傳
    if (isset($_FILES['head']) && $_FILES['head'] != '') {
      $conn = $this->getDoctrine()->getConnection();
      $data = $conn->fetchAssoc("SELECT id, head FROM contact WHERE id = ? LIMIT 1", array($user_id));
      //判斷用戶是否存在
      if(!empty($data['id'])) {
        //設置圖片保存路徑
        $path = 'image/head/';
        //獲取上傳文件后返回的文件名和擴展名
        $file_name = $this->uploadPic($user_id, 'head', $path);
        //修改用戶contact表head頭像字段的值
        $conn->executeUpdate("UPDATE contact SET head = ? WHERE id = ?", array($path . $file_name, $user_id));
        $result['flag'] = 1;
        $result['content'] = '上傳頭像成功!';
      } else {
        $result['flag'] = 3;
        $result['content'] = '用戶不存在!';
      }
    }else{
      $result['flag'] = 2;
      $result['content'] = '上傳失敗,沒有選擇圖片!';
    }
    return new Response(json_encode($result), '200', array('Content-Type' => 'application/json'));
  }
}