SunshinePHP Developer Conference 2015

Memcached::getMulti

(PECL memcached >= 0.1.0)

Memcached::getMultiRetrieve multiple items

Descrizione

public mixed Memcached::getMulti ( array $keys [, array &$cas_tokens [, int $flags ]] )

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. If cas_tokens variable is provided, it is filled with the CAS token values for the found items.

Nota:

Unlike Memcached::get() it is not possible to specify a read-through cache callback for Memcached::getMulti(), because the memcache protocol does not provide information on which keys were not found in the multi-key request.

The flags parameter can be used to specify additional options for Memcached::getMulti(). Currently, the only available option is Memcached::GET_PRESERVE_ORDER that ensures that the keys are returned in the same order as they were requested in.

Elenco dei parametri

keys

Array of keys to retrieve.

cas_tokens

The variable to store the CAS tokens for the found items.

flags

The flags for the get operation.

Valori restituiti

Returns the array of found items o FALSE in caso di fallimento. Utilizzare Memcached:getResultCode() se necessario.

Esempi

Example #1 Memcached::getMulti() example

<?php
$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);
?>

Il precedente esempio visualizzerĂ  qualcosa simile a:

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

Example #2 Memcached::GET_PRESERVE_ORDER example

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

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

$m->setMulti($data3600);

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

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

Il precedente esempio visualizzerĂ  qualcosa simile a:

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

Vedere anche:

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User Contributed Notes 1 note

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gabriel dot maybrun at demandmedia dot com
1 month 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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