Been getting this warjning all over my error logs
"PHP message: PHP Warning: Narrowing occurred during type inference. Please file a bug report on bugs.php.net in /srv/www/example.com/releases/20170922212452/web/wp/wp-settings.php on line 303" while reading response header from upstream, server: example.com, request: "GET / HTTP/2.0", upstream: "fastcgi://unix:/var/run/php-fpm-wordpress.sock:",
the bug has been reported here: https://bugs.php.net/bug.php?id=74980 .
How can I update PHP to remove this warning?