Memcache::increment Increment item's value intMemcache::increment stringkey intvalue Memcache::increment increments value of the item on the specified value. If item with key key was not numeric and cannot be converted to number, it will change it's value to value. Parameter value is optional. It's default value is 1. Do not use Memcache::increment with item, which was stored compressed, because consequent call to Memcache::get will fail. Also you can use memcache_increment function. See example below. connect('memcache_host', 11211); /* increment counter by 3 */ $current_value = $memcache_obj->increment('counter', 3); ?> ]]> Memcache::increment returns new item's value on success or &false; on failure. Memcache::increment does not create an item if it didn't exist. See also Memcache::decrement, Memcache::replace.