Problem with JSON+PHP

<?php
$json = '{
    "Installed Apps":[
        {
            "name": "Blog",
            "icon": "blog.png",
            "desc": "Drop a line"
        }

    ],
    "General Settings":[
        {
            "name": "Blog",
            "icon": "blog.png",
            "desc": "Drop a line"
        }
    ]
}';
$json = json_decode($json);
echo var_dump($json);
?>