File upload error solution

File upload error: This post was last edited by sspghost from 2014-01-2117:23:00. if some files are uploaded, an error is reported, for example, Warning: & nbsp; move_uploaded_file (D: /xampp/htdocs/ca file upload error
This post was last edited by sspghost at 17:23:00. if some files are uploaded, an error will be reported, for example, Warning: move_uploaded_file (D:/xampp/htdocs/ca/doc/new .txt): failed to open stream: Invalid argument in D: \ xampp \ htdocs \ ca \ do_upload.php on line 22

Warning: move_uploaded_file (): Unable to move 'd: \ xampp \ tmp \ php3BF8. tmp 'to 'D:/xampp/htdocs/ca/doc/new .txt' in D: \ xampp \ htdocs \ ca \ do_upload.php on line 22
Stored in: D:/xampp/htdocs/ca/doc/new. txt line22 is the 13th line of the following code.
If you change the txt name to a new text document, there is no problem... why?

 if ($_FILES["upload_file"]["error"] > 0)
    {
    echo "Return Code: " . $_FILES["upload_file"]["error"] . "
 ";
    }
  else
    {
    echo "Upload: " . $_FILES["upload_file"]["name"] . "
 ";
    echo "Type: " . $_FILES["upload_file"]["type"] . "
 ";
    echo "Size: " . ($_FILES["upload_file"]["size"] / 1024/1024) . " MB
 ";
    echo "Temp file: " . $_FILES["upload_file"]["tmp_name"] . "
 ";

      move_uploaded_file($_FILES["upload_file"]["tmp_name"],
      "D:/xampp/htdocs/ca/doc/" . $_FILES["upload_file"]["name"]);
      echo "Stored in: " . "D:/xampp/htdocs/ca/doc/" . $_FILES["upload_file"]["name"];
    }
$name=$_FILES["upload_file"]["name"];
$size=floor($_FILES["upload_file"]["size"] / 1024/1024 )."MB";
$loc="doc/" . $_FILES["upload_file"]["name"];
echo "
";
?>

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