Removes a variable from shared memory

# shm_remove_var

(PHP 4, PHP 5, PHP 7, PHP 8)

shm_remove_var — Removes a variable from shared memory

### Description

shm_remove_var(SysvSharedMemory `$shm`, int `$key`): bool

Removes a variable with a given `key` and frees the occupied memory.

### Parameters

`shm`
  A shared memory segment obtained from shm_attach().
`key`
  The variable key.

### Return Values

Returns `true` on success or `false` on failure.

### Changelog

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

### See Also

- shm_remove() - Removes shared memory from Unix systems

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