Memcached::get

(PECL memcached >= 0.1.0)

Memcached::get — Retrieve an item

Descrição

public mixed Memcached::get ( string $key [, callback $cache_cb [, double &$cas_token ]] )

Memcached::get() returns the item that was previously stored under the key . If the item is found and cas_token variable is provided, it will contain 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.

Parâmetros

key: The key of the item to retrieve.
cache_cb: Read-through caching callback or NULL.
cas_token: The variable to store the CAS token in.

Valor Retornado

Returns the value stored in the cache or FALSE otherwise. The Memcached::getResultCode will return Memcached::RES_NOTFOUND if the key does not exist.

Exemplos

Exemplo #1 Memcached::get() example #1


<?php
$m = new Memcached();
$m->addServer('localhost', 11211);

$m->set('foo', 100);
var_dump($m->get('foo'));
?>

O exemplo acima irá imprimir:

int(100)

Exemplo #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 */
        /* ...       */
    }
}
?>

Veja Também

Memcached::getByKey - Retrieve an item from a specific server
Memcached::getMulti - Retrieve multiple items
Memcached::getDelayed - Request multiple items

add a note User Contributed Notes
Memcached::get

miha at hribar dot info
17-Jul-2009 06:31


This method also returns false in case you set the value to false, so in order to have a proper fault mechanism in place you need to check the result code to be certain that a key really does not exist in memcached.



<?php

$Memcached = new Memcached();

$Memcached->addServer('localhost', 11211);

$Memcached->set('key', false);

var_dump($Memcached->get('key'));       // boolean false

var_dump($Memcached->getResultCode());  // int 0 which is Memcached::RES_SUCCESS

?>



Or just make sure the values are not false :)

add a note

Memcached::getByKey

Memcached::flush

Last updated: Fri, 13 Nov 2009