(PHP 3>= 3.0.10, PHP 4 >= 4.0.0)

posix_getsid -- Get the current sid of the process


int posix_getsid (int pid)

Return the sid of the process pid. If pid is 0, the sid of the current process is returned.

This is not a POSIX function, but is common on System V systems. If your system does not support this function at system level, this PHP function will always return FALSE.