shm_has_var
(PHP 5 >= 5.3.0, PHP 7)
shm_has_var — Check whether a specific entry exists
Description
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. |
See Also
- shm_get_var() - Returns a variable from shared memory
- shm_put_var() - Inserts or updates a variable in shared memory
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https://www.php.net/manual/en/function.shm-has-var.php