PHP script execution mode
This option determines if PHP scripts are run as the Apache web server user (typically httpd or apache), or the Unix user who owns the virtual server. The former is faster as it means that no additional processes need to be started to execute PHP code, but less secure as scripts read and write files as a user other than the domain owner.

If your system supports it, the FPM or FCGId options are the best, as they run PHP scripts quickly and as the domain owner. Otherwise, unless your system is heavily loaded or security between users is not an issue, the CGI wrapper option is recommended.

The mod_php mode is not recommended, as the small gain in performance should be balanced against the lack of security between virtual servers. Finally, the Disabled mode can be used to turn off PHP scripts entirely.