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https://github.com/predis/predis.git
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Daniele Alessandri
df2c9eb7ff
The base iterator class is now known as RedisCollectionIterator and we've also renamed a few methods to make their naming more generic.
100 lines
2.9 KiB
PHP
100 lines
2.9 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 'SharedConfigurations.php';
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use Predis\Collection\Iterator\KeyspaceIterator;
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use Predis\Collection\Iterator\SetIterator;
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use Predis\Collection\Iterator\SortedSetIterator;
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use Predis\Collection\Iterator\HashIterator;
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// Redis 2.8 features new commands allowing clients to incrementally
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// iterate over collections without blocking the server like it happens
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// when a command such as KEYS is executed on a Redis instance storing
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// millions of keys. These commands are SCAN (iterates over the keyspace),
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// SSCAN (iterates over members of a set), ZSCAN (iterates over members
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// and ranks of a sorted set) and HSCAN (iterates over fields and values
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// of an hash). Predis provides a specialized abstraction for each command
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// based on SPL iterators making it possible to easily consume SCAN-based
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// iterations in 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:$i");
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}
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// === KeyspaceIterator based on SCAN ===
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echo 'Scan the keyspace matching only our prefixed keys:' . PHP_EOL;
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foreach (new KeyspaceIterator($client, 'predis:*') as $key) {
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echo " - $key" . PHP_EOL;
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}
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/* OUTPUT
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Scan the keyspace matching only our prefixed keys:
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- predis:zset
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- predis:set
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- predis:hash
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*/
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// === SetIterator class based on SSCAN ===
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echo 'Scan members of `predis:set`:' . PHP_EOL;
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foreach (new SetIterator($client, 'predis:set') as $member) {
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echo " - $member" . PHP_EOL;
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}
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/* OUTPUT
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Scan members of `predis:set`:
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- member:1
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- member:4
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- member:0
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- member:3
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- member:2
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*/
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// === SortedSetIterator class based on ZSCAN ===
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echo 'Scan members and ranks of `predis:zset`:' . PHP_EOL;
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foreach (new SortedSetIterator($client, 'predis:zset') as $member => $rank) {
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echo " - $member [rank: $rank]" . PHP_EOL;
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}
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/* OUTPUT
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Scan members and ranks of `predis:zset`:
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- member:4 [rank: -4]
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- member:3 [rank: -3]
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- member:2 [rank: -2]
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- member:1 [rank: -1]
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- member:0 [rank: 0]
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*/
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// === HashIterator class based on HSCAN ===
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echo 'Scan fields and values of `predis:hash`:' . PHP_EOL;
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foreach (new HashIterator($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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