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posix_getrlimit	posix_getuid

POSIX Functions	Last updated: Mon, 26 Oct 2026

posix_getsid

(PHP 4, PHP 5, PHP 7, PHP 8)

posix_getsid — Get the current sid of the process

Description

function posix_getsid(int $process_id): int|false

Return the session id of the process process_id. The session id of a process is the process group id of the session leader.

Parameters

process_id: The process identifier. If set to 0, the current process is assumed. If an invalid process_id is specified, then false is returned and an error is set which can be checked with posix_get_last_error().

Return Values

Returns the identifier, as an int, or false on failure.

Examples

Example #1 Example use of posix_getsid()

<?php
$pid = posix_getpid();
echo posix_getsid($pid); //8805
?>

See Also

posix_getpgid() - Get process group id for job control
posix_setsid() - Make the current process a session leader
POSIX man page GETSID(2)

posix_getrlimit	posix_getuid

POSIX Functions	Last updated: Mon, 26 Oct 2026