PHP Manual
Semaphore 函数
Convert a pathname and a project identifier to a System V IPC key

ftok

(PHP 4 >= 4.2.0, PHP 5, PHP 7)

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

说明

ftok ( string $pathname , string $proj ) : int

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.

参数

pathname: Path to an accessible file.
proj: Project identifier. This must be a one character string.

返回值

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

参见

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

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