100 lines
2.7 KiB
PHP
100 lines
2.7 KiB
PHP
<?php
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/*
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* This file is part of the Predis package.
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*
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* (c) Daniele Alessandri <suppakilla@gmail.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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require __DIR__.'/shared.php';
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use Predis\Collection\Iterator;
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// Starting from Redis 2.8, clients can iterate incrementally over collections
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// without blocking the server like it happens when a command such as KEYS is
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// executed on a Redis instance storing millions of keys. These commands are:
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//
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// - SCAN (iterates over the keyspace)
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// - SSCAN (iterates over members of a set)
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// - ZSCAN (iterates over members and ranks of a sorted set)
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// - HSCAN (iterates over fields and values of an hash).
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// Predis provides a specialized abstraction for each command based on standard
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// SPL iterators making it possible to easily consume SCAN-based iterations in
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// your PHP code.
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//
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// See http://redis.io/commands/scan for more details.
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//
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// Create a client using `2.8` as a server profile (needs Redis 2.8!)
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$client = new Predis\Client($single_server, array('profile' => '2.8'));
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// Prepare some keys for our example
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$client->del('predis:set', 'predis:zset', 'predis:hash');
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for ($i = 0; $i < 5; ++$i) {
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$client->sadd('predis:set', "member:$i");
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$client->zadd('predis:zset', -$i, "member:$i");
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$client->hset('predis:hash', "field:$i", "value:$i");
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}
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// === Keyspace iterator based on SCAN ===
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echo 'Scan the keyspace matching only our prefixed keys:', PHP_EOL;
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foreach (new Iterator\Keyspace($client, 'predis:*') as $key) {
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echo " - $key", PHP_EOL;
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}
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/* OUTPUT
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Scan the keyspace matching only our prefixed keys:
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- predis:zset
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- predis:set
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- predis:hash
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*/
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// === Set iterator based on SSCAN ===
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echo 'Scan members of `predis:set`:', PHP_EOL;
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foreach (new Iterator\SetKey($client, 'predis:set') as $member) {
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echo " - $member", PHP_EOL;
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}
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/* OUTPUT
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Scan members of `predis:set`:
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- member:1
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- member:4
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- member:0
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- member:3
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- member:2
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*/
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// === Sorted set iterator based on ZSCAN ===
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echo 'Scan members and ranks of `predis:zset`:', PHP_EOL;
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foreach (new Iterator\SortedSetKey($client, 'predis:zset') as $member => $rank) {
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echo " - $member [rank: $rank]", PHP_EOL;
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}
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/* OUTPUT
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Scan members and ranks of `predis:zset`:
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- member:4 [rank: -4]
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- member:3 [rank: -3]
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- member:2 [rank: -2]
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- member:1 [rank: -1]
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- member:0 [rank: 0]
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*/
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// === Hash iterator based on HSCAN ===
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echo 'Scan fields and values of `predis:hash`:', PHP_EOL;
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foreach (new Iterator\HashKey($client, 'predis:hash') as $field => $value) {
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echo " - $field => $value", PHP_EOL;
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}
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/* OUTPUT
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Scan fields and values of `predis:hash`:
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- field:0 => value:0
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- field:1 => value:1
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- field:2 => value:2
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- field:3 => value:3
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- field:4 => value:4
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*/
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