Gets the keys stored on all the servers

# Memcached::getAllKeys

(PECL memcached >= 2.0.0)

Memcached::getAllKeys — Gets the keys stored on all the servers

### 说明

public function Memcached::getAllKeys(): array|false

Memcached::getAllKeys() queries each memcache server and retrieves an array of all keys stored on them at that point in time. This is not an atomic operation, so it isn't a truly consistent snapshot of the keys at point in time. As memcache doesn't guarantee to return all keys you also cannot assume that all keys have been returned.

> 注意:

> This method is intended for debugging purposes and should not be used at scale!

### 参数

此函数没有参数。

### 返回值

Returns the keys stored on all the servers on success 或者在失败时返回 `false`.

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