Symfony2 uses the third-party library Upload to create an image upload example, _PHP tutorial

"codeguy/upload": "*"

composer update

<&#63;php
/**
 * @author Sun
 * By blogs.zmit.cn http://blogs.zmit.cn
 * 原创作品，允许转载，转载时请务必以超链接形式标明文章原始出处 http://blogs.zmit.cn/6544.html
 * 中梦博客，作者信息和本声明。否则将追究法律责任。
 */
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));
  }
  /**
   * 上传图片
   *
   * @param type $user_id 用户的id，用作文件名
   * @param type $str   表单中file类型的input的name
   * @param type $path  保存路径
   * @return type
   */
  public function uploadPic($user_id, $str, $path) {
    $fs = new Filesystem();
    //检查路径是否存在
    if (!$fs->exists($path)) {
      //如果不存在，创建目录
      $fs->mkdir($path, 0700);
    }
    //使用Upload库
    $storage = new \Upload\Storage\FileSystem($path);
    $file = new \Upload\File($str, $storage);
    //如果文件名为空
    if ($file->getName() != '') {
      //设置文件名为用户的id
      $file->setName($user_id);
      //验证文件上传
      $file->addValidations(array(
        //指定文件类型
        new \Upload\Validation\Mimetype(array('image/png', 'image/jpg', 'image/jpeg', 'image/gif')),
        //指定文件大小
        new \Upload\Validation\Size('2M')
      ));
      //上传文件
      try {
        //成功
        $file->upload();
        //文件名和扩展名
        $file_name = $file->getNameWithExtension();
      } catch (\Exception $e) {
        //失败!
        $errors = $file->getErrors();
      }
    }
    //返回文件名和扩展名
    return $file_name;
  }
}

<&#63;php
/**
 * 联系人控制器
 * @author Sun
 * By blogs.zmit.cn http://blogs.zmit.cn
 * 原创作品，允许转载，转载时请务必以超链接形式标明文章原始出处 http://blogs.zmit.cn/6544.html
 * 中梦博客，作者信息和本声明。否则将追究法律责任。
 */
namespace ZM\ApiBundle\Controller;
//引用写好的上传图片方法uploadPic的Controller，并命名为BaseController
use ZM\AdminBundle\Controller\DefaultController AS BaseController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
//继承BaseController
class ContactController extends BaseController {
  /**
   * 用户上传头像
   *
   * @return Response
   */
  public function uploadHeadAction() {
    $request = Request::createFromGlobals()->request;
    $user_id = $request->get('user_id');
    //判断是否有文件上传
    if (isset($_FILES['head']) && $_FILES['head'] != '') {
      $conn = $this->getDoctrine()->getConnection();
      $data = $conn->fetchAssoc("SELECT id, head FROM contact WHERE id = &#63; LIMIT 1", array($user_id));
      //判断用户是否存在
      if(!empty($data['id'])) {
        //设置图片保存路径
        $path = 'image/head/';
        //获取上传文件后返回的文件名和扩展名
        $file_name = $this->uploadPic($user_id, 'head', $path);
        //修改用户contact表head头像字段的值
        $conn->executeUpdate("UPDATE contact SET head = &#63; WHERE id = &#63;", array($path . $file_name, $user_id));
        $result['flag'] = 1;
        $result['content'] = '上传头像成功！';
      } else {
        $result['flag'] = 3;
        $result['content'] = '用户不存在！';
      }
    }else{
      $result['flag'] = 2;
      $result['content'] = '上传失败，没有选择图片！';
    }
    return new Response(json_encode($result), '200', array('Content-Type' => 'application/json'));
  }
}