(PHP 5 >= 5.3.0, PHP 7)
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.
shm
A shared memory segment obtained from shm_attach().
key
The variable key.
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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https://www.php.net/manual/en/function.shm-has-var.php