php man page for posix_mkfifo

POSIX_MKFIFO(3) 							 1							   POSIX_MKFIFO(3)

posix_mkfifo - Create a fifo special file (a named pipe)

SYNOPSIS
       bool posix_mkfifo (string  $pathname, int  $mode)

DESCRIPTION
       posix_mkfifo(3)	creates  a  special  FIFO file which exists in the file system and acts as a bidirectional communication endpoint for pro-
       cesses.

PARAMETERS
	      o $pathname
		- Path to the FIFO file.

	      o $mode
		- The second parameter $mode has to be given in octal notation (e.g. 0644). The permission of the newly created FIFO also  depends
		on the setting of the current umask(3). The permissions of the created file are (mode & ~umask).

RETURN VALUES
	Returns TRUE on success or FALSE on failure.

NOTES
       Note

	      When  safe  mode is enabled, PHP checks whether the files or directories being operated upon have the same UID (owner) as the script
	      that is being executed.

PHP Documentation Group 													   POSIX_MKFIFO(3)