please help resiing image

hi,

this is my script to upload and image, change the file extension to lowercase and save the path to my db....to which I need to add a function to resize th image to 750px wide before saving it....please help

$uploadDir = '../uploads/';

if(isset($_POST['upload']))
{
fforeach ($_FILES as $file)
{
$fileName = strtolower($file['name']);
$tmpName = $file['tmp_name'];
$fileSize = $file['size'];
$fileType = $file['type'];

if($fileName==""){

$filePath = '../uploads/img/none.jpg';
}
else{

$filePath = $uploadDir . $fileName;
}

////assigning random name
//// get the file extension first
$ext = substr(strrchr($fileName, "."), 1); 

//// make the random file name
$randName = md5(rand() * time());

//// and now we have the unique file name for the upload file
$filePath = $uploadDir . $randName . '.' . $ext;

// Replace spaces with a '_'
$filePath = str_replace(" ", "_", $filePath);
$result = move_uploaded_file($tmpName, $filePath);


if(!get_magic_quotes_gpc())
{
$fileName = addslashes($fileName);
$filePath = addslashes($filePath);
}
$fileinsert[]=$filePath;
}