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Note Submitter: meuo80 at hotmail dot com ---- As my personal experience with my website https://www.qallwdall.com For example the webserver username and group is apache:www, if you set your to check UID, the php process will only have access to any file owned by the user apache. So if you have another webserver running on your system,for example tomcat with the username and group of tomcat:www, any files created by the tomcat process won't be accessible by php because it is owned by the tomcat user. But if you instead use GID check, the files created by the tomcat process will be readable by the php process because the belong to the same www group