group_keys_by_slot.php

<?php

require __DIR__.'/../autoload.php';

function group_keys_by_slot(\Predis\Cluster\StrategyInterface $strategy, array $keys) {
    $keysBySlot = [];

    foreach ($keys as $key) {
        $slot = $strategy->getSlotByKey($key);

        if (isset($keysBySlot[$slot])) {
            $keysBySlot[$slot][] = $key;
        } else {
            $keysBySlot[$slot] = [$key];
        }
    }

    return $keysBySlot;
}

$client = new \Predis\Client($parameters, ['cluster' => 'redis']);
$strategy = $client->getConnection()->getClusterStrategy();

$keys = ['{tag1}:abc', '{tag2}:123', '{tag1}:def', '{tag2}:456'];
$keysBySlot = group_keys_by_slot($strategy, $keys);

foreach ($keysBySlot as $slot => $keys) {
    $client->del($keys);
}
    
/*
array(2) {
  [4112]=>
  array(2) {
    [0]=>
    string(10) "{tag1}:abc"
    [1]=>
    string(10) "{tag1}:def"
  }
  [8307]=>
  array(2) {
    [0]=>
    string(10) "{tag2}:123"
    [1]=>
    string(10) "{tag2}:456"
  }
}
*/