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(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
ftok — Convert a pathname and a project identifier to a System V IPC key
$filename, string $project_id): int
The function converts the filename 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.
filename
Path to an accessible file.
project_id
Project identifier. This must be a one character string.
On success the return value will be the created key value, otherwise
-1 is returned.
