Problems with uploading a simple file.

[Solarpitch]

I am having so much trouble trying to implement a simple file upload script on my site. The file doesnt seem to upload to the defined directory and just gives me the message "invalid file" as per last echo.

 

I cant really see any problems to be honest

 

The code...

 

if ($_POST['process'] == 4) --> Just saying, if user clicked submit.
{


if (($_FILES["userfile"]["type"] == "image/gif")
|| ($_FILES["userfile"]["type"] == "image/jpeg")
|| ($_FILES["userfile"]["type"] == "image/pjpeg")
&& ($_FILES["userfile"]["size"] < 20000))
  {
  if ($_FILES["userfile"]["error"] > 0)
    {
    echo "Return Code: " . $_FILES["userfile"]["error"] . "<br />";
$execute = "no";
    }
  else
    {
    echo "Upload: " . $_FILES["userfile"]["name"] . "<br />";
    echo "Type: " . $_FILES["userfile"]["type"] . "<br />";
    echo "Size: " . ($_FILES["userfile"]["size"] / 1024) . " Kb<br />";
    echo "Temp file: " . $_FILES["userfile"]["tmp_name"] . "<br />";

    if (file_exists("user_images/" . $_FILES["userfile"]["name"]))
      {
      echo $_FILES["userfile"]["name"] . " already exists. ";
  $execute = "no";
      }
    else
      {
      move_uploaded_file($_FILES["userfile"]["tmp_name"],
      "user_images/" . $_FILES["userfile"]["name"]);
      echo "Stored in: " . "user_images/" . $_FILES["userfile"]["name"];
      $execute = "yes";
      }
    }
  }
else
  {
  echo "Invalid file";
  }

 

 

HTML *********

 

<form enctype="multipart/form-data" name="myform" method="post" action="upload_ad.php">
<input type="hidden" name="process" value="4">
<input type="submit" name="Submit" value="Submit Ad" onClick="return validate(this);">