posix_getlogin() will return boolean false when there is no shell, e.g. when running under an apache process
(PHP 4, PHP 5, PHP 7)
posix_getlogin — Return login name
Returns the login name of the user owning the current process.
Returns the login name of the user, as a string.
Example #1 Example use of posix_getlogin()
<?php
echo posix_getlogin(); //apache
?>
posix_getlogin() will return boolean false when there is no shell, e.g. when running under an apache process
Note that this function returns the owner that the process *started* as. Even if you call posix_setuid (or posix_seteuid) it will still report the username the process started as.
use get_current_user() to get the effective real user.