[edit] Last updated: Fri, 24 May 2013

Memcached::getServerByKey

(PECL memcached >= 0.1.0)

Memcached::getServerByKey — Map a key to a server

Description

public array Memcached::getServerByKey ( string $server_key )

Memcached::getServerByKey() returns the server that would be selected by a particular server_key in all the Memcached::*ByKey() operations.

Parameters

server_key: The key identifying the server to store the value on or retrieve it from. Instead of hashing on the actual key for the item, we hash on the server key when deciding which memcached server to talk to. This allows related items to be grouped together on a single server for efficiency with multi operations.

Return Values

Returns an array containing three keys of host, port, and weight on success or FALSE on failure. Use Memcached::getResultCode() if necessary.

Examples

Example #1 Memcached::getServerByKey() example


<?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'));
?>

The above example will output something similar to:

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)
}

add a note User Contributed Notes Memcached::getServerByKey - [1 notes]

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zhaoyong dot lc at gmail dot com ¶

1 month 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

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