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    Memcached::getServerByKey

    (PECL memcached >= 0.1.0)

    Memcached::getServerByKey — Dirige une clé sur un serveur

    Description

    public Memcached::getServerByKey(string $server_key): array|false

    Memcached::getServerByKey() retourne le serveur qui devrait être sélectionné par une clé server_key dans les opérations de type Memcached::*ByKey().

    Liste de paramètres

    server_key

    La clé d'identification du serveur.

    Valeurs de retour

    Retourne un tableau contenant 3 clés : host, port, et weight en cas de succès ou false si une erreur survient. Utilisez Memcached::getResultCode() si nécessaire.

    Exemples

    Exemple #1 Exemple avec Memcached::getServerByKey()

    <?php
    $m     = new Memcached();
    $m->addServers(array(
    array(    'mem1.domain.com', 11211, 40),
    array(    'mem2.domain.com', 11211, 40),
    array(    'mem3.domain.com', 11211, 20),
    ));

    $m->setOption(Memcached::OPT_LIBKETAMA_COMPATIBLE, true);

    var_dump($m->getServerByKey('user'));
    var_dump($m->getServerByKey('log'));
    var_dump($m->getServerByKey('ip'));
    ?>

    Résultat de l'exemple ci-dessus est similaire à :

    array(3) {
  ["host"]=>
  string(15) "mem3.domain.com"
  ["port"]=>
  int(11211)
  ["weight"]=>
  int(20)
}
array(3) {
  ["host"]=>
  string(15) "mem2.domain.com"
  ["port"]=>
  int(11211)
  ["weight"]=>
  int(40)
}
array(3) {
  ["host"]=>
  string(15) "mem2.domain.com"
  ["port"]=>
  int(11211)
  ["weight"]=>
  int(40)
}

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    User Contributed Notes 2 notes

    up
    5
    zhaoyong dot lc at gmail dot com
    11 years ago
    The parameter server_key is very confusing, it's not a server key for MemCached Server, but it's key,in key-value pair which you stored in server.

    <?php
    $m     = new Memcached;
    $m->addServers(array(
    array(    '127.0.0.1',11212),
    array(    '127.0.0.1',11211)
    ));
    for(    $i=0;$i<10;$i++){
    $key = 'key_'.$i;
    $m->add($key, 1);
    }
    for(    $i=0;$i<10;$i++) {
    $key = 'key_'.$i;
    $arr = $m->getServerByKey($key);
    echo (    $key.":\t".$arr['port']."\n");
    }
    ?>

    key_0: 11212
    key_1: 11211
    key_2: 11212
    key_3: 11212
    key_4: 11212
    key_5: 11211
    key_6: 11211
    key_7: 11212
    key_8: 11212
    key_9: 11211
    up
    1
    morphles
    8 years ago
    Just to clarify (as documentation of memcached, even for C lib, frankly is quite lacking), $server_key is hashed using same method as regular keys for values (I checked C source, as again docs......). So you should be able to see where set($key, $value) goes by using getServerByKey($key) with same key. This can be useful if one does not wish to bother with using/has no need to use *ByKey functions, but still want to know which servers are/should be used with regular keys, for implementing fallback or failure reporting.
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