Mastering PHP 7

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Much like MongoDB, Redis also does not have ACID support in a sense that MySQL has, which is alright really, as Redis is just a key/value store and not a relational database. Redis, however, provides a level of atomicity. Using MULTI, EXEC, DISCARD, and WATCH, we are able to execute a group of commands within a single step, during which Redis makes the following two guarantees:

• Another client request can never be served in the middle of our group-commands execution
• Either all or none of the commands are processed

Let's take a look at the following example:

<?phptry {    $client = new Redis();    $client->connect('localhost', 6379);    $client->multi();    $result1 = $client->set('tKey1', 'Test#1'); // Valid command    $result2 = $client ...