I need to loop through a local JSON file using PHP and am struggling to access the correct info. I need to retrieve the coordinates for each country and push these into a new array, with the country name as a key and the coordinates as values.

The JSON file looks like:

{
    "type": "FeatureCollection",
    "features": [
        {
            "type": "Feature",
            "properties": { "name": "Bahamas", "iso_a2": "BS", "iso_a3": "BHS", "iso_n3": "044" },
            "geometry": {
                "type": "MultiPolygon",
                "coordinates": [
                    [
                        [
                            [-77.53466, 23.75975],
                            [-77.78, 23.71],
                            [-78.03405, 24.28615],
                            [-78.40848, 24.57564],
                            [-78.19087, 25.2103],
                            [-77.89, 25.17],
                            [-77.54, 24.34],
                            [-77.53466, 23.75975]
                        ]
                    ],
                    [
                        [
                            [-77.82, 26.58],
                            [-78.91, 26.42],
                            [-78.98, 26.79],
                            [-78.51, 26.87],
                            [-77.85, 26.84],
                            [-77.82, 26.58]
                        ]
                    ],
                    [
                        [
                            [-77, 26.59],
                            [-77.17255, 25.87918],
                            [-77.35641, 26.00735],
                            [-77.34, 26.53],
                            [-77.78802, 26.92516],
                            [-77.79, 27.04],
                            [-77, 26.59]
                        ]
                    ]
                ]
            }
        },
        {
            "type": "Feature",

I've got the file in PHP using file_get_contents and json_decode, and have tried a foreach loop in PHP to access each nested element, but hit a snag when looping through the json with multiple errors:

Warning: foreach() argument must be of type array|object, null given

Warning: Undefined variable $features 

How could I access the coordinates, and add them to a new array?

EDIT:

code I'm using is:

features[0]->geometry->coordinates[0][0][0][0] as $coordinates)
{
    echo $coordinates;
}

?>