Upload Files to Remote Server, View Files on Remote Server and Delete Files from Remote Server

<?php
$allowedExtensions = array("zip", "doc", "docx", "pdf", "txt", "jpeg", "jpg", "gif", "png");
function isAllowedExtension($fileName)
{
global $allowedExtensions;
return in_array(end(explode(".", $fileName)), $allowedExtensions);
}

if ($_POST["submitted"]=="yes")
{
$location_to_send_files = strip_tags($_POST['location_to_send_files']);

if (!empty($location_to_send_files) && file_exists($location_to_send_files) && is_dir($location_to_send_files)) //Check if the users sets a location where he or she intends to send file to and also check to be sure that the location exists and its a directory
{
if(isset($_FILES["file"]) && $_FILES["file"]["name"] != "")
{
$file = $_FILES['file'];

if(isAllowedExtension($file['name']))
{
if(strrpos($location_to_send_files, '/')) //Check if user adds slash at the end of the given directory on the server where he or she intends to send file to
{
$upload_location = $location_to_send_files; //Do not add slash since the user has already added slash at the end of the given directory
}
else
{
$upload_location = $location_to_send_files.'/'; //Add slash at the end of the given directory because the user did not add slash and that's cool :)
}

if(move_uploaded_file($_FILES["file"]["tmp_name"], "$upload_location".$_FILES["file"]["name"]))
{
$upload_status = '<p style="font-family: helvetica, arial, 'lucida grande', sans-serif; font-size:12px; color:blue;">' . $_FILES["file"]["name"] . ' uploaded successfully to '.$location_to_send_files.'&nbsp;<img src="ok.gif" align="absmiddle"></p>';
}
else
{
$upload_status = '<p style="font-family: helvetica, arial, 'lucida grande', sans-serif; font-size:12px; color:red;">' . $_FILES["file"]["name"] . ' was unsuccessful&nbsp;<img src="cancel.gif" align="absmiddle"></p>';
}
}
else
{
$upload_status = '<p style="font-family: helvetica, arial, 'lucida grande', sans-serif; font-size:12px; color:red;">You attached an invalid file format. Allowed file types are: "zip", "doc", "docx", "pdf", "txt", "jpeg", "jpg", "gif", "png" <img src="cancel.gif" align="absmiddle"></p>';
}
}
else
{
$upload_status = '<p style="font-family: helvetica, arial, 'lucida grande', sans-serif; font-size:12px; color:red;">Please browse for a file that you wish to upload to proceed <img src="cancel.gif" align="absmiddle"></p>';
}
}
else //Proceed and upload file to the root directory since the user did not set any location to upload file
{
if(isset($_FILES["file"]) && $_FILES["file"]["name"] != "")
{
$file = $_FILES['file'];

if(isAllowedExtension($file['name']))
{
if(move_uploaded_file($_FILES["file"]["tmp_name"], "".$_FILES["file"]["name"]))
{
$upload_status = '<p style="font-family: helvetica, arial, 'lucida grande', sans-serif; font-size:12px; color:blue;">' . $_FILES["file"]["name"] . ' uploaded successfully to the root directory since your <b>Upload Location</b> is empty or does not exist&nbsp;<img src="ok.gif" align="absmiddle"></p>';
}
else
{
$upload_status = '<p style="font-family: helvetica, arial, 'lucida grande', sans-serif; font-size:12px; color:red;">' . $_FILES["file"]["name"] . ' was unsuccessful&nbsp;<img src="cancel.gif" align="absmiddle"></p>';
}
}
else
{
$upload_status = '<p style="font-family: helvetica, arial, 'lucida grande', sans-serif; font-size:12px; color:red;">You attached an invalid file format. Allowed file types are: "zip", "doc", "docx", "pdf", "txt", "jpeg", "jpg", "gif", "png" <img src="cancel.gif" align="absmiddle"></p>';
}
}
else
{
$upload_status = '<p style="font-family: helvetica, arial, 'lucida grande', sans-serif; font-size:12px; color:red;">Please browse for a file that you wish to upload to proceed <img src="cancel.gif" align="absmiddle"></p>';
}
}
}
?>