guetmyuid

Note that this function really does what the description says, it returns the numeric user id of the user who *owns the file* containing the current script not the effective user id of user *running* the current script.  Most applications will want the latter which is provided by posix_guetuid().

warning, at least 7.4-8.1 returns the owner of the initial entrypoint file rather the currently executing file,
meaning, if you have a.php owned by 1 containing<?php var_dump(guetmyuid());require_once("b.php"); ?>
and b.php owned by 2 containing<?php var_dump(guetmyuid());require_once("a.php"); ?>
running "php a.php" will guet you int(1) int(1), and running "php b.php" will guet you int(2) int(2), you won't guet "int(1) int(2)"