PHP obtains the par value in the array. how can this problem be solved?

PHP retrieves string (112) & nbsp; "{" code ":" 100 "," user ": {" name ":" Zhang San "}," msg ": "obtained successfully"} "& nbsp; PHP & nbsp; how to obtain & nbsp; user & nbsp; name & nbsp; in the brackets; what about the value? PHP obtains the nominal value in the array.

String (112) "{" code ":" 100 "," user ": {" name ":" Zhang San "}," msg ":" Retrieved "}"


How does PHP obtain the name value in the user brackets in the array? Php CodeIgniter? Share:
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$ S = '{"code": "100", "user": {"name": "Zhang San"}, "msg": "Retrieved "}';

Echo json_decode ($ s)-> user-> name; // Zhang San

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After json_decode is the object/array, it will be easier later.