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<?php
/*
* This file is part of the Predis package.
*
* (c) 2009-2020 Daniele Alessandri
* (c) 2021-2025 Till Krüss
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
require __DIR__ . '/shared.php';
// Predis allows to set Lua scripts as read-only operations for replication.
// This works for both EVAL and EVALSHA and also for the client-side abstraction
// built upon them (Predis\Command\ScriptCommand). This example shows a slightly
// more complex configuration that injects a new script command in the command
// factory used by the client and marks it as a read-only operation so that it
// will be executed on slaves.
use Predis\Command\ScriptCommand;
use Predis\Connection\Replication\MasterSlaveReplication;
use Predis\Replication\ReplicationStrategy;
// ------------------------------------------------------------------------- //
// Define a new script command that returns all the fields of a variable number
// of hashes with a single roundtrip.
class HashMultipleGetAll extends ScriptCommand
{
public const BODY = <<<LUA
local hashes = {}
for _, key in pairs(KEYS) do
table.insert(hashes, key)
table.insert(hashes, redis.call('hgetall', key))
end
return hashes
LUA;
public function getScript()
{
return self::BODY;
}
}
// ------------------------------------------------------------------------- //
$parameters = [
'tcp://127.0.0.1:6381?role=master&database=15',
'tcp://127.0.0.1:6382?role=slave&alias=slave-01&database=15',
];
$options = [
'commands' => [
'hmgetall' => 'HashMultipleGetAll',
],
'replication' => function () {
$strategy = new ReplicationStrategy();
$strategy->setScriptReadOnly(HashMultipleGetAll::BODY);
$replication = new MasterSlaveReplication($strategy);
return $replication;
},
];
// ------------------------------------------------------------------------- //
$client = new Predis\Client($parameters, $options);
// Execute the following commands on the master server using redis-cli:
// $ ./redis-cli HMSET metavars foo bar hoge piyo
// $ ./redis-cli HMSET servers master host1 slave host2
$hashes = $client->hmgetall('metavars', 'servers');
$replication = $client->getConnection();
$stillOnSlave = $replication->getCurrent() === $replication->getConnectionByAlias('slave-01');
echo 'Is still on slave? ', $stillOnSlave ? 'YES!' : 'NO!', PHP_EOL;
var_export($hashes);
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