php man page for posix_kill

POSIX_KILL(3)								 1							     POSIX_KILL(3)

posix_kill - Send a signal to a process

SYNOPSIS
       bool posix_kill (int  $pid, int	$sig)

DESCRIPTION
	Send the signal $sig to the process with the process identifier $pid.

PARAMETERS
	      o $pid
		- The process identifier.

	      o $sig
		- One of the PCNTL signals constants.

RETURN VALUES
	Returns TRUE on success or FALSE on failure.

SEE ALSO
	The  kill(2) manual page of the POSIX system, which contains additional information about negative process identifiers, the special pid 0,
       the special pid -1, and the signal number 0. .

PHP Documentation Group 													     POSIX_KILL(3)