# shm_remove_var

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

shm_remove_var — Removes a variable from shared memory

### 说明

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

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

### 参数

`shm`

  A shared memory segment obtained from shm_attach().

`key`

  The variable key.

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

### 更新日志

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

### 参见

- shm_remove() - Removes shared memory from Unix systems

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