HELP modify a novice's short code!!

[jettjordan23]

Hello all!  I have a very short piece of code that I was hoping that someone here could help me modify.  Essentially, I am attempting to code through an html form and a server side script that will allow a user to my website to upload a file to my server.  As of now, the code works, but for the last 8 hours, I have been trying to modify it to no luck.  What I would like the sever side script to do is to

 

1. Give each file uploaded a unique filename so that they do not write over other files with the same name.  I was thinking about adding a timestamp to the end of each name before it is saved..

2. Restrict the type of files uploaded to .pdfs and Microsoft word documents. 

 

Below, I have pasted both my form and my php.  Any help would be greatly appreciated.  I am a terrible programmer and have literally been up for 8 straight hours trying to get this to work, but too no avail.  Thank you so much for all of your help!

 

FORM

 

<form enctype="multipart/form-data" action="fileupload2.php" method="POST">
    <!-- MAX_FILE_SIZE must precede the file input field -->
    <input type="hidden" name="MAX_FILE_SIZE" value="30000" />
    <!-- Name of input element determines name in $_FILES array -->
    Send this file: <input name="userfile" type="file" />
    <input type="submit" value="Send File" />
</form>

 

 

SERVER SIDED SCRIPT

<?php

echo 'Upload result:<br>'; // At least one symbol should be sent to response!!!

$uploaddir = dirname($_SERVER['SCRIPT_FILENAME'])."/../";

echo '<pre>';
if(count($_FILES) > 0)
{
$arrfile = pos($_FILES);
$uploadfile = $uploaddir . basename($arrfile['name']);

if (move_uploaded_file($arrfile['tmp_name'], $uploadfile))
   echo "File is valid, and was successfully uploaded.\n";
}
else
echo 'No files sent. Script is OK!'; //Say to Flash that script exists and can receive files

echo 'Here is some more debugging info:';
print_r($_FILES);

echo "</pre>";

?>

 

EDITED BY WILDTEEN88: Please use code tags (

)

[jettjordan23]

Also, for some reason, I can only save files to my root directory.  I cannot inster say "/uploads/" so that it will save in a folder called uploads.  Does anyone know why this is so?