"use" statements are required to be placed after the "namespace my\space" but before the "{".
e.g.
<?php
namespace foo\bar;
use my\space\MyClass;
{
// place code here
} // end of namespace foo\bar
namespace another\bar;
use my\space\MyClass;
use my\space\AnotherClass;
{
// place code here
} // end of namespace another\bar
?>