(PECL memcached >= 0.1.0)
Memcached::flush — Invalidate all items in the cache
public Memcached::flush ([ int $delay = 0 ] ) : bool
Memcached::flush() invalidates all existing cache items immediately (by default) or after the delay
specified. After invalidation none of the items will be returned in response to a retrieval command (unless it's stored again under the same key after Memcached::flush() has invalidated the items). The flush does not actually free all the memory taken up by the existing items; that will happen gradually as new items are stored.
delay
Number of seconds to wait before invalidating the items.
Returns true
on success or false
on failure. Use Memcached::getResultCode() if necessary.
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https://www.php.net/manual/en/memcached.flush.php