How to use json_decode a post_meta value? [duplicate]

The values look like they have been serialized using maybe_serialize( $data ).

If that’s the case, then you can reverse that with maybe_unserialize( $original ).

As per this answer, unserialize( $str ) will also create a PHP value from a stored representation.

Try:

$mydata="a:3:{i:0;s:6:"ozujak";i:1;s:7:"travanj";i:2;s:7:"svibanj";}";

$mydata = unserialize($mydata);

echo $mydata[0]; // ozujak

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