PHP json_decode array vs. object benchmark

gistfile1.txt

<?php

$iterations = 1000000;
$initialTime = microtime(true);
$jsonString = <<<JSON
{
    "Response":
    {
        "MetaInfo":
        {
            "Timestamp":"2014-01-20T19:28:58.495+0000",
            "NextPageInformation":"2"
        },
        "View":[
            {
                "_type":"SearchResultsViewType",
                "ViewId":0,
                "Result":[
                    {
                        "Relevance":1,
                        "Distance":0.1,
                        "MatchLevel":"houseNumber",
                        "MatchQuality":
                        {
                            "Country":1,
                            "State":1,
                            "County":1,
                            "City":1,
                            "District":1,
                            "Street":[
                                1
                            ],
                            "HouseNumber":1,
                            "PostalCode":1
                        },
                        "MatchType":"pointAddress",
                        "Location":
                        {
                            "LocationId":"LINK_931447247_R_PA_31617980",
                            "LocationType":"point",
                            "DisplayPosition":
                            {
                                "Latitude":52.53086,
                                "Longitude":13.38469
                            },
                            "NavigationPosition":[
                                {
                                    "Latitude":52.53098,
                                    "Longitude":13.38458
                                }
                            ],
                            "MapView":
                            {
                                "TopLeft":
                                {
                                    "Latitude":52.5319842,
                                    "Longitude":13.3828421
                                },
                                "BottomRight":
                                {
                                    "Latitude":52.5297358,
                                    "Longitude":13.3865379
                                }
                            },
                            "Address":
                            {
                                "Label":"Invalidenstraße 116, 10115 Berlin, Deutschland",
                                "Country":"DEU",
                                "State":"Berlin",
                                "County":"Berlin",
                                "City":"Berlin",
                                "District":"Mitte",
                                "Street":"Invalidenstraße",
                                "HouseNumber":"116",
                                "PostalCode":"10115",
                                "AdditionalData":[
                                    {
                                        "value":"Deutschland",
                                        "key":"CountryName"
                                    },
                                    {
                                        "value":"Berlin",
                                        "key":"StateName"
                                    }
                                ]
                            },
                            "MapReference":
                            {
                                "ReferenceId":"931447247",
                                "MapVersion":"Q4/2013",
                                "Spot":0.31,
                                "SideOfStreet":"right",
                                "CountryId":"20147700",
                                "StateId":"20187401",
                                "CountyId":"20187402",
                                "CityId":"20187403",
                                "DistrictId":"20187417"
                            }
                        }
                    }
                ]
            }
        ]
    }
}
JSON;

for ($i = 0; $i < $iterations; $i++) {
    json_decode($jsonString);
}

echo "Object: " . (microtime(true) - $initialTime) . "s" . PHP_EOL;

$initialTime = microtime(true);

for ($i = 0; $i < $iterations; $i++) {
    json_decode($jsonString, true);
}

echo "Array: " . (microtime(true) - $initialTime) . "s" . PHP_EOL;