My wife just opened a PNB account, you need to keep a balance of 5000 php.
She also has BDO account, but I think she may have gone under the minimum requirement.

Interesting, when we went into a BDO branch, there were girls working there, carrying little baskets, full of 500 or 1000 php notes, great wads of them.
Openly putting them infront of us & putting them through the counting machines.

The 2 armed guards, on the door prevent you from doing anything silly.