Disconnects from shared memory segment

# shm_detach

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

shm_detach — Disconnects from shared memory segment

### 说明

function shm_detach(SysvSharedMemory `$shm`): true

shm_detach() disconnects from the shared memory given by the `shm` created by shm_attach(). Remember, that shared memory still exist in the Unix system and the data is still present.

### 参数

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

### 返回值

总是返回 `true`。

### 更新日志

版本 | 说明
--- | ---
8.5.0 | The return type is `true` now; previously, it was bool.
8.0.0 | `shm` expects a SysvSharedMemory instance now; previously, a resource was expected.

### 参见

- shm_attach() - Creates or open a shared memory segment
- shm_remove() - Removes shared memory from Unix systems
- shm_remove_var() - Removes a variable from shared memory

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