Bien, entonces tengo algunos problemas al tratar de averiguar cómo pasar algunos datos que he guardado en localStorage a un script php que escribí, para poder enviarlos a mi base de datos en un servidor. Encontré un código anterior,https://developer.mozilla.org/en-US/docs/DOM/XMLHttpRequest/Using_XMLHttpRequest), parecía que funcionaría pero no tuve suerte con eso.

Aquí está el código donde estoy guardando los datos y que estoy intentando pasarlos por mi phpscript

function getLocation() {
        if (navigator.geolocation) {
            navigator.geolocation.getCurrentPosition(initialize, showError, takeSnap);
        }
        else {
            alert("Geolocation is not supported by this browser.");
        }
    }

function initialize(position) {
        var lat = position.coords.latitude,
            lon = position.coords.longitude;

        var mapOptions = {
            center: new google.maps.LatLng(lat, lon),
            zoom: 14,
            mapTypeId: google.maps.MapTypeId.ROADMAP,
            mapTypeControl: true
        }

        var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);
        var marker = new google.maps.Marker({
            position: new google.maps.LatLng(lat, lon),
            map: map,
            title: "Current Location"
        });
    }

function showError(error) {
        switch (error.code) {
            case error.PERMISSION_DENIED:
                alert("User denied the request for Geolocation.");
                break;
            case error.POSITION_UNAVAILABLE:
                alert("Location information is unavailable.");
                break;
            case error.TIMEOUT:
                alert("The request to get user location timed out.");
                break;
            case error.UNKNOWN_ERROR:
                alert("An unkown error occurred.");
                break;
        }
    }

function storeLocal(position) {
        if (typeof (Storage) !== "undefined") {
            var lat = position.coords.latitude,
                lon = position.coords.longitude;

            localStorage.latitude = lat;
            localStorage.longitude = lon;
        }
        else {
            alert("Your Browser doesn't support web storage");
        }

        return
    }

    function snapShot() {
        if (navigator.geolocation) {
            navigator.geolocation.getCurrentPosition(storeLocal, showError);
        }
        else {
            alert("Geolocation is not supported by this browser.");
        }

        var oReq = new XMLHttpRequest();
        oReq.onload = reqListener;
        oReq.open("post", "snap.php?lat=" + localStorage.latitude + "&lon=" + localStorage.longitude, true);
        oReq.send();            
    }

    function reqListener() {
        console.log(this.reponseText);
    }

Este es el script que escribí para guardar valores en la base de datos.

    <?php
    // Connecting to the database
    mysql_connect("localhost", "username", "password");
    mysql_select_db("db_name");

    $latitude = mysql_real_escape_string($_GET["lat"]);
    $longitude = mysql_real_escape_string($_GET["lon"]);

    // Submit query to insert new data
    $sql = "INSERT INTO locationsTbl(locID, lat, lon ) VALUES( 'NULL', '". $latitude ."', '". $longitude . "')";
    $result = mysql_query( $sql );

    // Inform user
    echo "<script>alert('Location saved.');</script>";

    // Close connection
    mysql_close();
    ?>