Php on freebsd why can file permissions fail?

Question

PHP

there is a self-written article editor on the site (not written by me)
periodically, for some unknown reason, the editor cannot access the files created by himself, to the point that you have to correct access rights from under the root.
Has anyone experienced this and what could be causing it?

Answer 1

You would write what rights the files get when they are created from the editor, and what rights they should have.

Answer 2

selinux?

Answer 3

Most likely - the rights of a directory influence. especially SetUID, SetGroup, sTicky.
Also see the function that creates files - what is the access mode.
Well, it would be nice - an example of rights that turned out to be wrong, and which ones should be. correct.