> On Jan 28, 2020, at 17:55, Michael Cordover <m...@mjec.net> wrote: > > On Tue, Jan 28, 2020, at 18:47, Ben Ramsey wrote: >> If you take mutation off the table, then things become easier, IMO. We >> only need two magic methods: >> >> * __toInteger(): int >> * __toFloat(): float >> >> Then, in any mathematical context, PHP could call the appropriate >> method and use the number returned in the calculation. > > I don't think this is enough to make operator overloading useful, even > without mutation. > > For example, the result of TimeInterval(1, 'ms') + TimeInterval(3, 'days') > requires more information that we'd get out of __toInteger or __toFloat, but > could still be a useful operation to perform, and ought to return a new > TimeInterval (not an int). There are many of these tagged-number types where > overloading would be helpful.
I just remembered this extension from a few years back. It’s no longer maintained, but it might help your efforts: https://github.com/php/pecl-php-operator Cheers, Ben
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