delay commands in PHP

[sparek]

I'm looking for a way to delay a shell command in PHP. Specifically, I want to delete a file after approximately 30 minutes of elapsed time. I tried using the at command. Also, the server that I'm running this on is Linux based. Any help would be appreciated.

Thanks

[gid]

try something like:

exec('(sleep 30; rm /the/full/path) &');