predis hmset nested array in value

Question

I am using predis php client. My code is like:

$ObjArray = get_object_vars ( $obj );     
$redis->hmset("post:4545",$objArray);

ObjArray is like: array( "id" => 1212, "name" => "test", "likes" => array(1,2,3), "comments" => array(0=>(1,2,3),1=>(1,2,3))

With this I get the error: redis ERR Protocol error: invalid bulk length

Can't we have array in value of redis hashe?

Answer 1

Redis hashes are not multidimensional so field values can only be strings. The values in likes and comments in your $ObjArray variable are arrays which means they are not good, you should either serialize them (JSON or whichever serialization format you prefer) or store them into different and separate keys.