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: /mnt/lmsestudio-instance-vol002/eagleead/vendor/predis/predis/examples/ [ drwxr-xr-x ]
name : transaction_using_cas.php <?php /* * This file is part of the Predis package. * * (c) Daniele Alessandri <suppakilla@gmail.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ require __DIR__.'/shared.php'; // This is an implementation of an atomic client-side ZPOP using the support for // check-and-set (CAS) operations with MULTI/EXEC transactions, as described in // "WATCH explained" from http://redis.io/topics/transactions // // First, populate your database with a tiny sample data set: // // ./redis-cli // SELECT 15 // ZADD zset 1 a 2 b 3 c // // Then execute this script four times and see its output. // function zpop($client, $key) { $element = null; $options = array( 'cas' => true, // Initialize with support for CAS operations 'watch' => $key, // Key that needs to be WATCHed to detect changes 'retry' => 3, // Number of retries on aborted transactions, after // which the client bails out with an exception. ); $client->transaction($options, function ($tx) use ($key, &$element) { @list($element) = $tx->zrange($key, 0, 0); if (isset($element)) { $tx->multi(); // With CAS, MULTI *must* be explicitly invoked. $tx->zrem($key, $element); } }); return $element; } $client = new Predis\Client($single_server); $zpopped = zpop($client, 'zset'); echo isset($zpopped) ? "ZPOPed $zpopped" : 'Nothing to ZPOP!', PHP_EOL;