PHP mysqldump creates empty file

Question

I'm trying run exec with mysqldump in my PHP file. It doesn't work, I'm even trying to use it without variables like this:

exec('mysqldump --user=xx --password=xx --host=xx db settings > /output/dump5.sql');

It creates empty file.

But when I run this command in ssh, it works. Why?

Answer 1

Do you need to do this from php script?

I assume that you want to do the backup frequently, so maybe adding it to cron job will better solution.