How to set script execution time when migrating from PHP 5.6 to PHP 7.2?

Question

PHP

Some processes on the server require a long time (the volumes are huge in places to process). And when switching from PHP 5.6 to PHP 7.2, this thing pops up

Gateway Timeout

The gateway did not receive a timely response from the upstream server or application.
Apache/2.4.10 (Debian) Server at mydomain.ru Port 443

At the same time, it doesn't seem to work in any way ... On the server, if anything, nginx is not installed. ini_set('max_execution_time', '3600');

Answer 1

Gateway Timeout is not necessarily php related. I would even say "most likely php has nothing to do with it at all". This is if not nginx, then apache is visible. And he also has a config and there is also a timeout.
httpd.apache.org/docs/2.2/mod/core.html#timeout

Answer 2

Write directly in the ini file.
Tweak Apache settings, c. Htaccess
And inside the script, try
set_time_limit(0);

Answer 3

.htaccess file

<IfModule mod_php5.c>
php_value max_execution_time 300
</IfModule>