Step 1. Log in to the server via SSH
Step 2. You can see your sites PHP information by putting an info.php
Create an info.php under your domain’s document root
<?php phpinfo(); ?>
Save the file.
Step 3. Set the permission for the info.php. For this, now call your domain.com/info.php you could see the PHP settings, then locate the domain’s php.ini location from the info.php
It looks like the above-mentioned location.
In that php.ini enable the output_buffering
output_buffering = 1
Save the php.ini.
Step 4. Restart the httpd
service httpd restart
Now check the site after clearing your browser cache. It should be working fine.