$.ajax({
    url: "/php/script.php",
    dataType: "json",
    data: {
        lat: 13.37,
        lng: 3.1415926535
    },
    type: "POST",
    success: function (data) {
        console.log(data)
    },
    error: function (xhr) {
        alert("Whoop, " + xhr.status + " - " + xhr.statusText)
    }
})