Memcached::get

(PECL memcached >= 0.1.0)

Memcached::get — Retrieve an item

Beschreibung

public Memcached::get(string $key, callable $cache_cb = ?, int $flags = ?): mixed

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_EXTENDED is 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 */
        /* ...       */
    }
}
?>