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Memcache
PHP Manual

# Predefined Constants

Memcache Constants
Name | Description
--- | ---
`MEMCACHE_COMPRESSED` (integer) | Used to turn on-the-fly data compression on with Memcache::set, Memcache::add and Memcache::replace.
`MEMCACHE_HAVE_SESSION` (integer) | 1 if this Memcache session handler is available, 0 otherwise.
`MEMCACHE_USER1` (integer) | Used to turn user-defined application flag on with Memcache::set, Memcache::add and Memcache::replace.
`MEMCACHE_USER2` (integer) | Used to turn user-defined application flag on with Memcache::set, Memcache::add and Memcache::replace.
`MEMCACHE_USER3` (integer) | Used to turn user-defined application flag on with Memcache::set, Memcache::add and Memcache::replace.
`MEMCACHE_USER4` (integer) | Used to turn user-defined application flag on with Memcache::set, Memcache::add and Memcache::replace.