问用php上传图片，有些图片不上传

EN

$allowedExts = array("gif", "jpeg", "jpg", "png");
 $temp = explode(".", $_FILES["file"]["name"]);
$extension = end($temp);
 if ((($_FILES["file"]["type"] == "image/gif")
 || ($_FILES["file"]["type"] == "image/jpeg")
 || ($_FILES["file"]["type"] == "image/jpg")
|| ($_FILES["file"]["type"] == "image/pjpeg")
|| ($_FILES["file"]["type"] == "image/bmp")
|| ($_FILES["file"]["type"] == "image/JPG")
|| ($_FILES["file"]["type"] == "image/x-png")
 || ($_FILES["file"]["type"] == "image/png"))
 && ($_FILES["file"]["size"] < 4000000)
 && in_array($extension, $allowedExts))
   {
   if ($_FILES["file"]["error"] > 0)
     {
     echo "Return Code: " . $_FILES["file"]["error"] . "<br>";
     }
   else
     {
     echo "Upload: " . $_FILES["file"]["name"] . "<br>";
     echo "Type: " . $_FILES["file"]["type"] . "<br>";
     echo "Size: " . ($_FILES["file"]["size"] / 1024) . " kB<br>";
     echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br>";

     if (file_exists("cultmapsite/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: " . "cultmapsite/upload" . $_FILES["file"]["name"];
       }
     }
   }
 else
   {
   echo "Invalid file";
   }