Improve php-fpm -t

Description

if pool.conf contains:

php_admin_value[memory_limit] = 128MB

it does not overwrite the global php.ini,except memory_limit is not set in php.ini, than 128M will be used.

this is either coaccidently the php build in default
OR
an emergc fall back in php-fpm to as in "better try this than nothing"

Suggestion:

add checks to "php-fpm -t" to find:

a) wrong arguments
b) stupid configs which will cause php-fpm master to crash in an endless loop with "code 70"
c) "if you know something, say something"

Example:

if "process.max = 80" is lower than an start servers together ( or other sanity checks ) , than say something and don't lure the using user in a false hope of "it can work" , just to endless crash with "code 70" which tells you: i crash, but not why i crashed" which is VVVVVVEEEEEEERRRYYYY annoying btw.

PHP 8.4.18 (fpm-fcgi) (built: Feb 10 2026 17:48:03) (NTS gcc x86_64)
Copyright (c) The PHP Group
Built by Fedora Project
Zend Engine v4.4.18, Copyright (c) Zend Technologies
with Zend OPcache v8.4.18, Copyright (c), by Zend Technologies

Non sono indicati file sorgente o test. Inizia riproducendo il comportamento segnalato di pool.conf e php.ini con php-fpm -t, quindi traccia il punto di ingresso della validazione e la gestione degli errori esistente. Il completamento dovrebbe includere controlli concordati per configurazioni non valide o non sicure, con diagnostica azionabile e test che li coprano.