(PECL memcache >= 0.2.0)
Memcache::increment — Increment item's value
Memcache::increment() increments value of an item by
the specified value. If item specified by
key was not numeric and cannot be converted to a
number, it will change its value to value.
Memcache::increment() does not
create an item if it doesn't already exist.
Also you can use memcache_increment() function.Note:
Do not use Memcache::increment() with items that have been stored compressed because subsequent calls to Memcache::get() will fail.
keyKey of the item to increment.
value
Increment the item by value.
Returns new items value on success or false on failure.
Example #1 Memcache::increment() example
<?php
/* procedural API */
$memcache_obj = memcache_connect('memcache_host', 11211);
/* increment counter by 2 */
$current_value = memcache_increment($memcache_obj, 'counter', 2);
/* OO API */
$memcache_obj = new Memcache;
$memcache_obj->connect('memcache_host', 11211);
/* increment counter by 3 */
$current_value = $memcache_obj->increment('counter', 3);
?>