(PHP 4, PHP 5, PHP 7)
posix_getlogin — Return login name
posix_getlogin ( ) : string
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 ?>
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https://www.php.net/manual/en/function.posix-getlogin.php