Semaphore Functions
PHP Manual

shm_has_var

Check whether a specific entry exists

Description

bool shm_has_var(SysvSharedMemory $shm, int $key)

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.

See Also

  • shm_get_var
  • shm_put_var