How to store a Japanese Character in json

I'm trying to save a json_encoded strings to the database but whenever i do i get this:

u30abu30bf

when saving:

カタ

how do i decode such a thing?

tried php utf8_decode and encode but i doesn't seem to work, i also tried reading the threads below:

here is a var_dump data of $flex_encoded before passing it as a parameter:

//this one seems to passing the right encoding
[{"japanese_name":"u30cau30abu30cd"},{"japanese_name":"u30cau30abu30cd"}]

here is the function call:

$this->updateFlexData($game_id, $flex_encoded);

here is the function for updating my db:

function updateFlexData($game_id, $json_data)
{
    $arrVal = array(
        'json_data'=> $json_data,
    );

    Db::getInstance()->autoExecute('japanese_names', $arrVal, 'UPDATE', " game_id = '".$game_id."'", false);
}

database column type is:

`json_data` longtext CHARACTER SET utf8 COLLATE utf8_bin NOT NULL

my PHP version:

PHP Version 5.3.10

Try JSON_UNESCAPED_UNICODE

json_encode($data, JSON_UNESCAPED_UNICODE);

And instead of this u7537u6027u304cu5f7cu5973u306bu7740u3066... you're going to get 男性が彼...

after hours of tinkering with the code i somehow made it to work: ok its maybe not the solution but:

$japanese_name = json_encode($japanese_text); //returns "u30cau30abu30cd"

$jp = str_replace(""","",$japanese_name); //returns u30cau30abu30cd

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