Check whether a specific entry exists

# shm_has_var

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

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

`↑` and `↓` to navigate • `Enter` to select • `Esc` to close • `/` to open