Database - Triggers or no Triggers?

First, Note: This app im creating isnt for a website that ill be using, its actually an app that others will be downloading and using in their own networks.

There are plenty of times in my app where a value in the database needs to be populated when the row is inserted or updated...

EG..

• assets.created needs to be set to time() when the asset is created
  
• assets.modified needs to be updated to time() when the row is updated
  
• sessions_assoc.regens needs to be set to regens+1 when its updated
  

Obviously this can be done in the PHP just fine. But ive gotten in the habit of using MySQL Triggers to accomplish this.
EG:

CREATE TRIGGER assets_list_created BEFORE INSERT ON assets_list FOR EACH ROW SET new.created = UNIX_TIMESTAMP(NOW())

CREATE TRIGGER assets_list_updated BEFORE UPDATE ON assets_list FOR EACH ROW SET new.modified = UNIX_TIMESTAMP(NOW())

It seems to work just fine, except when I have someone else import a MySQL dump and their user is different than mine, but im sure I can find a way around that.

So im just curious how many people use PHP to accomplish these kinds of things, and how many use SQL Triggers.