I'm sure something like this has been implemented before (and I can think of a few simple ways to implement it off the top of my head), but I think it would be beneficial for us to implement a synchronous sleep() command that works similarly to unix sleep.

Usage would be as follows:

cd('mydir');
touch('file.txt'); // update the time stamp
sleep(1); // sleep for a second
// Now we're at least 1 second after that updated time stamp

One practical use case I can imagine would be for this line in our test script, since we want to verify that time stamps are actually changed before and after the sleeping.