How can I access first-level keys of a 2D array using a foreach loop?

Access First-Level Keys of a 2D Array with a Foreach Loop

To retrieve the first-level keys of a multidimensional array using a foreach loop, you can employ the following syntax:

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

Consider the following example:

<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>

In this code, the $places array contains a two-dimensional structure representing cities (Philadelphia) and their associated places. The outer foreach loop iterates over the first-level keys (cities), accessing both the keys (Philadelphia) and the values ($site in this case). Within each $site, the inner loop iterates over the second-level keys (places) and accesses their values, displaying the 'place_name' field.

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