CentOS Linux release 8.0.1905 not taking change of php.ini

I want to remove output_buffering and want to make change to memory_limit by editing etc/php.ini file

But none of my changes are taking effect. After editing etc/php.ini file as a super user. I've restarted httpd.service using following command

sudo systemctl restart httpd.service

I am using centOS 8

[root@backend adminuser]# cat /etc/*release
CentOS Linux release 8.0.1905 (Core)
NAME="CentOS Linux"
VERSION="8 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8"
PLATFORM_ID="platform:el8"
PRETTY_NAME="CentOS Linux 8 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-8"
CENTOS_MANTISBT_PROJECT_VERSION="8"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="8"

CentOS Linux release 8.0.1905 (Core)
CentOS Linux release 8.0.1905 (Core)

php-common packages are as below

[root@backend adminuser]# rpm -qc php-common
/etc/php-zts.d/20-bz2.ini
/etc/php-zts.d/20-calendar.ini
/etc/php-zts.d/20-ctype.ini
/etc/php-zts.d/20-curl.ini
/etc/php-zts.d/20-exif.ini
/etc/php-zts.d/20-fileinfo.ini
/etc/php-zts.d/20-ftp.ini
/etc/php-zts.d/20-gettext.ini
/etc/php-zts.d/20-iconv.ini
/etc/php-zts.d/20-phar.ini
/etc/php-zts.d/20-sockets.ini
/etc/php-zts.d/20-tokenizer.ini
/etc/php.d/20-bz2.ini
/etc/php.d/20-calendar.ini
/etc/php.d/20-ctype.ini
/etc/php.d/20-curl.ini
/etc/php.d/20-exif.ini
/etc/php.d/20-fileinfo.ini
/etc/php.d/20-ftp.ini
/etc/php.d/20-gettext.ini
/etc/php.d/20-iconv.ini
/etc/php.d/20-phar.ini
/etc/php.d/20-sockets.ini
/etc/php.d/20-tokenizer.ini
/etc/php.ini

For SSE Script I want to make output_buffer as null or Off like my another server but its not taking any change. I tested by changing php.ini as a root user and restarted httpd services.

I am assuming you are using php-fpm Following command worked for me.

1. Connect via terminal and Make sure you are Super(Root) user

   sudo su

2. Now run following command

   sudo systemctl restart php-fpm.service

Note : Test by making small change like increasing or decreasing memory_limit in php config file and run above command and review change using phpinfo()