Php uploader

Question

Hello.  I am trying to include the ability to upload a file in my website.  I am using the sample code from w3c to try it out.
<?php
if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/pjpeg"))
&& ($_FILES["file"]["size"] < 20000))
  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("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/" . $_FILES["file"]["name"];
else
  echo "Invalid file";
?>
When I use this, every file I try to upload is an "Invalid file".
When I remove restrictions every file I try to upload returns.
Upload:
Type:
Size: 0 Kb
Temp file:
already exists.
The file is uploading.  I have watched "Activity Monitor" and larger files take a correspondingly longer time to upload.
Here is the html.
<div id="picture"><p>Please ensure that your filenames reflect your organization and project, and then click the "Browse" button.</p><form action="uploader.php" method="post" enctype="multipart/form-data" id="upload">
<input type="hidden" name="MAX_FILE_SIZE" value="50000000" />
Choose a file to upload: <input name="uploadedfile" type="file" />
<input type="submit" value="Upload File" />
</form></div>
Here is the .php with restrictions removed except for size.
<?php
if ($_FILES["file"]["size"] < 50000000)
  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("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";
?>
Any help is greatly appreciated.

Answer 1

Every occurrence of this kind of code -
$_FILES["file"]["type"]
should be replaced with this -
$_FILES["uploadedfile"]["type"]