How to get server user?

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I've been looking over the output from phpinfo to find a way
to portably get the server user name. It is not obvious to me...

Can I get that from an $_ENV or $_SERVER value?

I have a web base cms system with a file editor and
want to test for ownership of the files and directories
without having to hard code the server name.

I can get file owner ship but if I want to verify it is
the server user account, I would do:
(pseudo code)
$_name = getOwner()
if($_name == < portable reference to server user name>)
  {
  // proceed
}

This would be for enhanced access permissions analysis.
If a file is being written to by the server user (via php code)
it would be helpful to determine that to forstall error message
generation.

Thanks
JK

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