Hi, Internals.

I've been absent for a long time due to poor health. I'm finally back.

I maintain a legacy application written in PHP, and occasionally need to
fake the current time for testing purposes. However, PHP doesn't provide a
standard way to fake the current time, so I've been changing the OS's
current time to do this, which is quite painful.

This can be avoided by using third-party libraries (such as
Carbon::setTestNow()). However, it's almost impossible to modify all parts
of a legacy application that depend on the current time.

Another option is to use libfaketime (https://github.com/wolfcw/libfaketime),
but this is also quite painful to use.

Since this was absolutely necessary for my work, I implemented this
functionality as a PHP Extension. (Please ignore the dirty implementation
related to PDO. I'm not planning to propose it this time.)

https://github.com/colopl/php-colopl_timeshifter

However, this Extension has some problems.

The first is that there's no way to determine whether the format passed to
the ext-date parser is relative or absolute time, resulting in a dirty hack
using usleep. The second is that it depends on timelib, so it breaks when
upstream changes related to timelib are made.

So, how about adding a `date_set_test_now(\DateInterval $shiftInterval)`
function to ext-date?

This function would treat the current time as shifted by the passed
DateInterval. Since it's implemented on the ext-date side, there's no need
for dirty hacks using usleep.

I'd like to hear your opinions. Thank you.

Best Regards,
Go Kudo

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