Memcached::get
(PECL memcached >= 0.1.0)
Memcached::get — Retrieve an item
Beschreibung
Memcached::get() returns the item that was previously
stored under the key. If the item is found and
the flags is given Memcached::GET_EXTENDED,
it will also return the CAS token value for the item. See
Memcached::cas() for how to use CAS tokens. Read-through caching callback may be
specified via cache_cb parameter.
Parameter-Liste
-
key -
The key of the item to retrieve.
-
cache_cb -
Read-through caching callback or
null. -
flags -
Flags to control the returned result. When
Memcached::GET_EXTENDEDis given, the function will also return the CAS token.
Rückgabewerte
Returns the value stored in the cache or false otherwise.
If the flags is set to Memcached::GET_EXTENDED,
an array containing the value and the CAS token is returned instead of only the value.
The Memcached::getResultCode() will return
Memcached::RES_NOTFOUND if the key does not exist.
Changelog
| Version | Beschreibung |
|---|---|
| PECL memcached 3.0.0 |
The &cas_token parameter was removed.
Instead flags was added and when it is given the value of Memcached::GET_EXTENDED it will ensure the CAS token to be fetched.
|
Beispiele
Beispiel #1 Memcached::get() example #1
<?php
$m = new Memcached();
$m->addServer('localhost', 11211);
$m->set('foo', 100);
var_dump($m->get('foo'));
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
int(100)
Beispiel #2 Memcached::get() example #2
<?php
$m = new Memcached();
$m->addServer('localhost', 11211);
if (!($ip = $m->get('ip_block'))) {
if ($m->getResultCode() == Memcached::RES_NOTFOUND) {
$ip = array();
$m->set('ip_block', $ip);
} else {
/* log error */
/* ... */
}
}
?>
Siehe auch
- Memcached::getByKey() - Retrieve an item from a specific server
- Memcached::getMulti() - Retrieve multiple items
- Memcached::getDelayed() - Request multiple items
