fwrite set owner group

I currently have a process that writes a file. The file is created with owner and group of 'apache'.

How do I create the file so it's the same as all the other files which is 'abcd' and the group id 'xyz'?

Thanks.

PHP Code:

---

        $Handle = fopen($filename, 'w') or die("can't open file");
    $Data = "Data in file.  \n";
    fwrite($Handle, $Data);
    fclose($Handle); 


---