PHP Manual
Функции семафоров
Check whether a specific entry exists

shm_has_var

(PHP 5 >= 5.3.0, PHP 7)

shm_has_var — Check whether a specific entry exists

Описание

shm_has_var ( SysvSharedMemory $shm , int $key ) : bool

Checks whether a specific key exists inside a shared memory segment.

Список параметров

shm: A shared memory segment obtained from shm_attach().
key: The variable key.

Возвращаемые значения

Returns true if the entry exists, otherwise false

Список изменений

Версия	Описание
8.0.0	`shm` expects a SysvSharedMemory instance now; previously, a resource was expected.

Смотрите также

shm_get_var() - Returns a variable from shared memory
shm_put_var() - Inserts or updates a variable in shared memory