@artcore. foolproof for my purposes intval(strval('15.20 ' * 100))

@snapey You should never be sorry for changing Best answer.

If your own answer is the best, then it is best to mark that. Will make it easier for others with the same issue, to find the best solution.

Sorry for bumping this up, but I just wanted to share how I handled this on a project.

If you have the bcmath extension available you can use bcmul

https://www.php.net/manual/en/function.bcmul.php

$ php artisan tinker
Psy Shell v0.10.4 (PHP 7.4.10 — cli) by Justin Hileman
>>> intval(bcmul('8.03', 100.0, 2))
=> 803
>>> intval(bcmul('150.2', 100.0, 2))
=> 15020
>>> intval(bcmul('19.99', 100.0, 2))
=> 1999

Which can be paired with bcdiv when converting back:

$ php artisan tinker
Psy Shell v0.10.4 (PHP 7.4.10 — cli) by Justin Hileman
>>> floatval(bcdiv(803, 100.0, 2))
=> 8.03
>>> floatval(bcdiv(10520, 100.0, 2))
=> 105.2
>>> floatval(bcdiv(1999, 100.0, 2))
=> 19.99

I ended up using this because for a particular project I needed 6-digits decimal precision. I am actually not aware if using the intval/strval pair would work on that project, so thanks for sharing.