(PHP 4, PHP 5, PHP 7)
posix_getuid — Return the real user ID of the current process
posix_getuid ( ) : int
Return the numeric real user ID of the current process.
Returns the user id, as an int
Example #1 Example use of posix_getuid()
<?php echo posix_getuid(); //10000 ?>
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https://www.php.net/manual/en/function.posix-getuid.php