(PECL memcached >= 2.0.0)
Memcached::getAllKeys — Gets the keys stored on all the servers
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.
锟剿猴拷锟斤拷没锟叫诧拷锟斤拷锟斤拷
Returns the keys stored on all the servers on success 锟斤拷锟斤拷锟斤拷失锟斤拷时锟斤拷锟斤拷 FALSE
.