Setting Permissions With Php File Uploader

if(!isset($_POST['upload'])) {
echo '
<form name="upload" enctype="multipart/form-data" method="POST" action="'.$_SERVER['REQUEST_URI'].'">
<input type="file" name="file" size="13" value="">
<br /><input type="submit" name="upload" value="Upload">
</form>
';
} else {
if(
($_FILES["file"]["type"] == "image/gif") ||
($_FILES["file"]["type"] == "image/jpeg") ||
($_FILES["file"]["type"] == "image/png") ||
($_FILES["file"]["type"] == "image/jpg")
){

$uploaddir = 'uploads/';
$filename = $_FILES['file']['name'];
$filesize = $_FILES['file']['size'];
$tmpname_file = $_FILES['file']['tmp_name'];
    $date_file = date(imdy);
move_uploaded_file($tmpname_file, "$uploaddir$date_file$filename");

//Connection MySQL

//Select DB

//update MySQL


}else{
echo"Invalid file type.";

}  
}