Display Geojson data from PHP API (http://localhost/sample.php) on google map

You can use Ajax and leaflet for displaying GeoJSON data. Here is a detailed example of GeoJSON in leaflet.

You have to modify 'Ajax' given below according to your php.

$.ajax({
        type: "POST",
        url: "YourPHP.php",
        dataType: 'json',
        success: function (response) {


       var gj = L.geoJson(response, {
            style: oldStyle
        }).addTo(map);
     });