Do I need to restart Apache after changing the php.ini file?

Depends, actually. Depends on how you use php inside that webserver:

  • using php as module inside the http server: you have to restart the http server process
  • using php as cgi backend: you do not have to restart the http server process or anything else
  • using php fastcgi: you have to restart the fastcgi daemon, not the http server
  • using php-fpm: you have to restart the fpm server process, not the http server process

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