Redis with multidimensional array in php

Question

I'm trying to use redis with multidimensional array by using HMSET.
My array looks like this.

Array
(
    [t] => Hello
    [a] => This
    [c] => key
    [b] => 23
    [data] => Array
        (
            [1] => some value
            [more] => value
        )

)

Is there any way I can store data in this format in the redis using predis library.

my Question was to add multidimensional array by using hash, if we serialise and store then it will be string, and we wont be able to sort or query into it. — Mukesh Yadav
– Mukesh Yadav, Commented May 23, 2012 at 11:05
That naturally is not possible. In your case you could serialze the data key only, and keep the rest as-is - if it helps. If not, you need to further on normalize the array structure. See en.wikipedia.org/wiki/Database_normalization — hakre
– hakre, Commented May 23, 2012 at 13:04

brasofilo · Accepted Answer · 2014-05-30 12:09:24Z

4

A better way to do this is by json_encode your array in PHP and store it as set in Redis

$string = json_encode(Array
(
    [t] => Hello
    [a] => This
    [c] => key
    [b] => 23
    [data] => Array
        (
            [1] => some value
            [more] => value
        )   
));

edited May 30, 2014 at 12:09

brasofilo

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answered May 30, 2014 at 12:05

Chhavi Gangwal

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Comments

hakre · Accepted Answer · 2015-04-12 05:04:29Z

3

Yes, Redis is able to store strings and PHP is able to serialize (multidimensional) array to strings.

The serialize function in the example can be used for that exact job, but is only exemplary, you can use any serialization method that serializes your data into a (binary) string.

For example you can make use of JSON (json_encode), XML or in some cases just implode might be fitting.

$string = serialize(Array
(
    [t] => Hello
    [a] => This
    [c] => key
    [b] => 23
    [data] => Array
        (
            [1] => some value
            [more] => value
        )

));

$cmdSet = $redis->createCommand('set');
$cmdSet->setArgumentsArray(array('thisispredisdoingredis', $string));

edited Apr 12, 2015 at 5:04

answered May 19, 2012 at 11:58

hakre

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2 Comments

Pars Over a year ago

does not this serialize and unserialize decrease performance?

Luke Over a year ago

Redis doesn't speak PHP so you need to send it in a format you can store in Redis. Two contesters would be to serialize as a PHP object (results in a PHP specific string, see answer) or as JSON (also a string). Serialization always takes time but it's probably negligible, when important (and to be sure), do some tests.

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