foreach 루프를 사용하여 2D 배열의 첫 번째 수준 키에 어떻게 액세스할 수 있나요?

<code class="php">foreach ($array as $key => $value)</code>

<code class="php">$places = [
    'Philadelphia' => [
        [
            'place_name' => 'XYZ',
            'place_id' => 103200,
            'place_status' => 0,
        ],
        [
            'place_name' => 'YYYY',
            'place_id' => 232323,
            'place_status' => 0,
        ],
    ]
];

foreach ($places as $siteKey => $site) {
    echo "City: $siteKey" . PHP_EOL;  // Philadelphia

    foreach ($site as $place) {
        echo "\tPlace Name: {$place['place_name']}" . PHP_EOL;
    }
}</code>