Memcached::get

    (PECL memcached >= 0.1.0)

    Memcached::get — Retrieve an item

    Description

    public Memcached::get(string $key, ?callable $cache_cb = null, int $get_flags = 0): mixed

    Memcached::get() returns the item that was previously stored under the key. If the item is found and the get_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.

    Parameters

    key

    The key of the item to retrieve.

    cache_cb

    Read-through caching callback or null.

    get_flags

    Flags to control the returned result. When Memcached::GET_EXTENDED is given, the function will also return the CAS token.

    Return Values

    Returns the value stored in the cache or false otherwise. If the get_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 Description
    PECL memcached 3.0.0 The &cas_token parameter was removed. Instead get_flags was added and when it is given the value of Memcached::GET_EXTENDED it will ensure the CAS token to be fetched.

    Examples

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

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

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

    The above example will output:

    int(100)

    Example #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 */
    /* ... */
    }
    }
    ?>

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    User Contributed Notes 4 notes

    up
    12
    letynsoft at gmail dot com
    7 years ago
    As of some version of php7 (i was not able to determine which exactly).
    The $cas_token is no longer valid argument. It has been removed in favor of flags argument, as it appears to be causing issues when subclassing the Memcached class.

    See https://github.com/php-memcached-dev/php-memcached/pull/214 for more details.

    Basically you need to
    <?php
    function memcacheGet($key, $cb = null, &$cas = null) {
    $m = memcacheGetObject();
    if(empty(    $m))
    return     false;
    if(    defined('Memcached::GET_EXTENDED')) {
    //Incompatible change in php7, took me 2 hours to figure this out, grrr
    $_o = $m->get($key, $cb, Memcached::GET_EXTENDED);
    $o = $_o['value'];
    $cas = $_o['cas'];
    } else {
    $o = $m->get($key, $cb, $cas);
    }
    return     $o;
    }
    ?>
    up
    10
    miha at hribar dot info
    15 years ago
    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 :)
    up
    0
    Anonymous
    44 minutes ago
    For more than one flag use bitwise or

    Memcached::GET_EXTENDED | Memcached::GET_PRESERVE_ORDER
    up
    -2
    denis_truffaut[A-T]hotmail[D-O-T]com
    13 years ago
    Note that this function can return NULL as FALSE, so don't make checks with === FALSE as with the old Memcache class, because it won't work. :O

    Use the not (!) operator and check the result code with getResultCode() as mentioned in the documentation :)
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