shm_has_var

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

shm_has_var — Check whether a specific entry exists

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

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

Returns true if the entry exists, otherwise false

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

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