(PECL memcached >= 0.1.0)
Memcached::increment — Increment numeric item's value
Memcached::increment() increments a numeric item's value by the specified offset . If the item's value is not numeric, it is treated as if the value were 0. Memcached::increment() will fail if the item does not exist.
The key of the item to increment.
The amount by which to increment the item's value; defaults to 1.
如果成功则返回 TRUE，失败则返回 FALSE。 The Memcached::getResultCode will return Memcached::RES_NOTFOUND if the key does not exist.
Example #1 Memcached::increment() example
<?php
$m = new Memcached();
$m->addServer('localhost', 11211);
$m->set('counter', 0);
$m->increment('counter');
$m->increment('counter', 10);
var_dump($m->get('counter'));
$m->set('key', 'abc');
$m->increment('counter');
?>
上例将输出：
int(11) string(1) "1"