Also to answer your question on the difference between local/global values:
Master Value
This comes from your main php.ini file (the one being loaded above in the ‘Loaded configuration file’ section). This is the value which applies server-wide.
Local Value
The global setting can be overridden locally in multiple locations, such as httpd.conf , .htaccess or other Apache configuration.
This is often used to get around restrictive settings at the server level, and can sometimes mean that making changes at the top global level doesn’t trickle down to your specific folder or location. So if you have a discrepancy between the two, check for a local .htaccess or a *.ini file within your Mautic directory (or check with your hosting provider!)
Also, remember you might well need to restart apache in order for changes to take effect in your php.ini file! Caught me out many times forgetting to restart in the past!
Hope that helps some!