(PHP 4 >= 4.2.0, PHP 5)
ftok — Convert a pathname and a project identifier to a System V IPC key
The function converts the pathname of an existing accessible file and a project identifier into an integer for use with for example shmop_open() and other System V IPC keys.
Path to an accessible file.
Project identifier. This must be a one character string.
On success the return value will be the created key value, otherwise -1 is returned.