JSON using PHP to get selected values

Been looking thru stackoverflow about this so I did try to get this correct. Not sure what I'm doing wrong here. Any suggestions?

 <?php
    $string = '{
    "status": "success",
    "th_size": "small",
    "users": [
        {
            "user_id": 159826,
            "username": "WillBeUsed",
            "online": true,
            "is_away": false,
            "access": "public",
            "render_info": {
                "profile_url": "/person1",
                "profile_image": "11e5a496f13366a0c4ce000403aa862",
                "language": "english",
                "chat": "ready"
            },
            "new": false,
            "back": false
        }
    ],
    "online_count": 1
}';
    $result = json_decode($string, true);

//echo $result['status']; // This works
echo $result->users[0]->render_info->profile_url; // This don't work
    ?>
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