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PHP 7.3.0 Alpha 2 is available, and the first tests of XOOPS are looking good, so far no problems found :)
http://php.net/archive/2018.php#id2018-06-21-1
Of course, more testing will be required, so please help us with that!
Upcoming PHP 7.3 will be up to 25% faster than 7.0 https://www.phoronix.com/scan.php?page=news_item&px=PHP-7.3-Alpha-1-Benchmarks