shm_has_var

PHP 5 >= 5.3.0, PHP 7, PHP 8
shm_has_var - Check whether a specific entry exists
Manual

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

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

Parameters

shm

A shared memory segment obtained from shm_attach.

key

The variable key.

Return Values

Returns true if the entry exists, otherwise false

Changelog

Version Description
8.0.0 shm expects a SysvSharedMemory instance now; previously, a resource was expected.

Related Functions

Function shm_has_var:

  • Manual

Semaphore, Shared Memory and IPC Functions

Most used PHP functions