The European Focus (which is what we have in PH) and the Mazda3 are both used on the Ford/Volvo C1 global platform (along with the Volvo S40). The Focus also uses the same MZR-Z6 engine as the Mazda3, for the 1.6L.

In other words, aside from the skin and some suspension tuning changes they are pretty much the same car. But.. you can buy the Focus in manual transmission version, and the older ones have some goodies the Mazda lacks (rear aircon vents for example). It is Euro-style though (headlight switch on the dash rather than a stick on the steering wheel, weird position of the reverse gear on the manual transmission).