In what capacity is the PHP program read and write data? Is it another user?

In what capacity is PHP program read and write files? Is it another user?
In what capacity is PHP program read and write files? Is it another user or what?

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The CLI runs as the current user, with the Web server running normally as a nobody user, which is the least privileged user
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As the case may be, the rest should not open write permissions except for directories that the program needs to write.
In general, the owner should be root, the member of the group can include FTP users and so on.

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