seems like error syntax… :
● apache2.service - The Apache HTTP Server
Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Sat 2020-09-05 21:01:44 UTC; 23min ago
Docs: https://httpd.apache.org/docs/2.4/
Process: 6446 ExecStart=/usr/sbin/apachectl start (code=exited, status=1/FAILURE)
Sep 05 21:01:44 srv-b.democrasite.com systemd[1]: Starting The Apache HTTP Server...
Sep 05 21:01:44 srv-b.democrasite.com apachectl[6446]: AH00526: Syntax error on line 25 of /etc/apache2/conf.d/domains/opaz-ateliers.com.conf:
Sep 05 21:01:44 srv-b.democrasite.com apachectl[6446]: Invalid command 'php_admin_value', perhaps misspelled or defined by a module not included in the server configuration