var rbu_layer
$.getJSON("getdata.php", function(data) {
        var length = data.station_code.length;
        var station_code = [];
        var localid = feature.properties.localId;
        for (var i = 0; i < length; i++) {
            station_code[i] = data.station_code[i];
            if (station_code[i]==localid) {
                var popupContent = localid + "</br>" + station_code[i];
            }
        }
});
function onEachFeature(feature, layer) {

    if (feature.properties && feature.properties.popupContent) {
        layer.bindPopup(feature.properties.popupContent);
    }
    layer.bindPopup(popupContent);
}
var map = L.map('map').setView([51.505, -0.09], 3);

rbu_layer = L.geoJSON(rbd, {
    onEachFeature: onEachFeature
}).addTo(map);
map.fitBounds(rbu_layer.getBounds());