thinkphp how to receive a picture of the iOS post coming back

$upload = new \Think\Upload();// 实例化上传类             $upload->maxSize   =     3145728 ;// 设置附件上传大小         $upload->exts      =     array('jpg', 'gif', 'png', 'jpeg');//          $upload->savePath  =      '/Public/Uploads/images/';         $info   =   $upload->upload();         if(!$info) {// 上传错误提示错误信息             $this->error($upload->getError());         }         这种方法接收不到呢？ 是哪里问题呢！求大牛告知

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$upload = new \Think\Upload();// 实例化上传类             $upload->maxSize   =     3145728 ;// 设置附件上传大小         $upload->exts      =     array('jpg', 'gif', 'png', 'jpeg');//          $upload->savePath  =      '/Public/Uploads/images/';         $info   =   $upload->upload();         if(!$info) {// 上传错误提示错误信息             $this->error($upload->getError());         }         这种方法接收不到呢？ 是哪里问题呢！求大牛告知

  
    0)    {    echo "Return Code: " . $_FILES["file"]["error"] . "
";    }  else    {    echo "Upload: " . $_FILES["file"]["name"] . "
";    echo "Type: " . $_FILES["file"]["type"] . "
";    echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb
";    echo "Temp file: " . $_FILES["file"]["tmp_name"] . "
";    if (file_exists("upload/" . $_FILES["file"]["name"]))      {      echo $_FILES["file"]["name"] . " already exists. ";      }    else      {      move_uploaded_file($_FILES["file"]["tmp_name"],      "upload/" . $_FILES["file"]["name"]);      echo "Stored in: " . "upload/" . $_FILES["file"]["name"];      }    }  }else  {  echo "Invalid file";  }?>

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