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    Memcached::getMulti

    (PECL memcached >= 0.1.0)

    Memcached::getMulti — Retrieve multiple items

    Description

    public Memcached::getMulti(array $keys, int $get_flags = 0): array|false

    Memcached::getMulti() is similar to Memcached::get(), but instead of a single key item, it retrieves multiple items the keys of which are specified in the keys array.

    Note:

    Before v3.0 a second argument &cas_tokens was in use. It was filled with the CAS token values for the found items. The &cas_tokens parameter was removed in v3.0 of the extension. It was replaced with a new flag Memcached::GET_EXTENDED that needs is to be used as the value for get_flags.

    The get_flags parameter can be used to specify additional options for Memcached::getMulti(). Memcached::GET_PRESERVE_ORDER ensures that the keys are returned in the same order as they were requested in. Memcached::GET_EXTENDED ensures that the CAS tokens will be fetched too.

    Parameters

    keys

    Array of keys to retrieve.

    get_flags

    The flags for the get operation.

    Return Values

    Returns the array of found items or false on failure. Use Memcached::getResultCode() if necessary.

    Changelog

    Version Description
    PECL memcached 3.0.0 The &cas_tokens parameter was removed. The Memcached::GET_EXTENDED was added and when passed as a flag it ensures the CAS tokens to be fetched.

    Examples

    Example #1 Memcached::getMulti() example for Memcached v3

    <?php
    // Valid for v3 of the extension

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

    $items = array(
    'key1' => 'value1',
    'key2' => 'value2',
    'key3' => 'value3'
    );
    $m->setMulti($items);
    $result = $m->getMulti(array('key1', 'key3', 'badkey'));
    var_dump($result);
    ?>

    The above example will output something similar to:

    array(2) {
  ["key1"]=>
  string(6) "value1"
  ["key3"]=>
  string(6) "value3"
}

    Example #2 Memcached::getMulti() example for Memcached v1 and v2

    <?php
    // Valid for v1 and v2 of the extension

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

    $items = array(
    'key1' => 'value1',
    'key2' => 'value2',
    'key3' => 'value3'
    );
    $m->setMulti($items);
    $result = $m->getMulti(array('key1', 'key3', 'badkey'), $cas);
    var_dump($result, $cas);
    ?>

    The above example will output something similar to:

    array(2) {
  ["key1"]=>
  string(6) "value1"
  ["key3"]=>
  string(6) "value3"
}
array(2) {
  ["key1"]=>
  float(2360)
  ["key3"]=>
  float(2362)
}

    Example #3 Memcached::GET_PRESERVE_ORDER example for Memcached v3

    <?php
    // Valid for v3 of the extension

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

    $data = array(
    'foo' => 'foo-data',
    'bar' => 'bar-data',
    'baz' => 'baz-data',
    'lol' => 'lol-data',
    'kek' => 'kek-data',
    );

    $m->setMulti($data, 3600);

    $keys = array_keys($data);
    $keys[] = 'zoo';
    $got = $m->getMulti($keys, Memcached::GET_PRESERVE_ORDER);

    foreach (    $got as $k => $v) {
    echo     "$k $v\n";
    }
    ?>

    The above example will output something similar to:

    foo foo-data
bar bar-data
baz baz-data
lol lol-data
kek kek-data
zoo

    Example #4 Memcached::GET_PRESERVE_ORDER example for Memcached v1 and v2

    <?php
    // Valid for v1 and v2 of the extension

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

    $data = array(
    'foo' => 'foo-data',
    'bar' => 'bar-data',
    'baz' => 'baz-data',
    'lol' => 'lol-data',
    'kek' => 'kek-data',
    );

    $m->setMulti($data, 3600);

    $null = null;
    $keys = array_keys($data);
    $keys[] = 'zoo';
    $got = $m->getMulti($keys, $null, Memcached::GET_PRESERVE_ORDER);

    foreach (    $got as $k => $v) {
    echo     "$k $v\n";
    }
    ?>

    The above example will output something similar to:

    foo foo-data
bar bar-data
baz baz-data
lol lol-data
kek kek-data
zoo

    See Also

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    User Contributed Notes 1 note

    up
    1
    gabriel dot maybrun at demandmedia dot com
    10 years ago
    GOTCHA: Recently I was tasked with moving from PECL memcache to PECL memcached and ran into a major problem -- memcache and memcached serialize data differently, meaning that data written with one library can't necessarily be read with the other library.

    For example, If you write an object or an array with memcache, it's interpreted as an integer by memcached. If you write it with memcached, it's interpreted as a string by memcache.

    tl;dr - You can't safely switch between memcache and memcached without a either a cache flush or isolated cache environments.

    <?php
    $memcache     = new Memcache;
    $memcacheD = new Memcached;
    $memcache->addServer($host);
    $memcacheD->addServers($servers);

    $checks = array(
    123,
    4542.32,
    'a string',
    true,
    array(    123, 'string'),
    (object)array(    'key1' => 'value1'),
    );
    foreach (    $checks as $i => $value) {
    print     "Checking WRITE with Memcache\n";
    $key = 'cachetest' . $i;
    $memcache->set($key, $value);
    usleep(100);
    $val = $memcache->get($key);
    $valD = $memcacheD->get($key);
    if (    $val !== $valD) {
    print     "Not compatible!";
    var_dump(compact('val', 'valD'));
    }

    print     "Checking WRITE with MemcacheD\n";
    $key = 'cachetest' . $i;
    $memcacheD->set($key, $value);
    usleep(100);
    $val = $memcache->get($key);
    $valD = $memcacheD->get($key);
    if (    $val !== $valD) {
    print     "Not compatible!";
    var_dump(compact('val', 'valD'));
    }
    }
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