(PECL memcached >= 2.0.0)
Memcached::touch — Set a new expiration on an item
$key
   , int $expiration
   )Memcached::touch() sets a new expiration value on the given key.
key
     The key under which to store the value.
expiration
     The expiration time, defaults to 0. See Expiration Times for more info.
   Returns TRUE on success or FALSE on failure.
   Use  Memcached::getResultCode() if necessary.