posix_ctermid

Generates a string which is the pathname for the current controlling terminal for the process. On error this will set errno, which can be checked using posix_get_last_error()

Upon successful completion, returns string of the pathname to the current controlling terminal. Otherwise FALSE is returned and errno is set, which can be checked with posix_get_last_error().

<?php
echo "I am running from ".posix_ctermid();
?>

posix_ttyname() -

posix_get_last_error() -