Using PHP for nightly backend tasks?

[Charles]

I have to develop a script to be run nightly to go through a database
and send emails based on conditions. It's a large database, and there
are several thousands of emails to be sent during the week everyday.
The script will be run with a cron job at midnight or so.

I was wondering if PHP is suitable for this, or may it be problematic,
for instance would its execution abort after a certain amount of time?
Or is it perfectly fine for this task?
Thanks.