Convert a pathname and a project identifier to a System V IPC key

# ftok

(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

### Description

ftok(string `$filename`, string `$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.

### Parameters

`filename`
  Path to an accessible file.
`project_id`
  Project identifier. This must be a one character string.

### Return Values

On success the return value will be the created key value, otherwise `-1` is returned.

### See Also

- shmop_open() - Create or open shared memory block
- sem_get() - Get a semaphore id

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