gps.php

<?php 

// THIS IS ONLY A SAMPLE SCRIPT. PLEASE TWEAK IT TO YOUR NEEDS.
// IT COMES WITH NO WARRANTY WHATSOEVER. $file = "./tmp/gps-position.php";
// you might save in a database instead...

if (isset($_GET["lat"]) && preg_match("/^-?\d+\.\d+$/", $_GET["lat"])
    && isset($_GET["lon"]) && preg_match("/^-?\d+\.\d+$/", $_GET["lon"]) ) {
    $fh = fopen($file, "w");
    if (!$fh) {
        header("HTTP/1.0 500 Internal Server Error");
        exit(print_r(error_get_last(), true));
    }
    fwrite($fh, "{\"lat\":".$_GET["lat"].",\"lon\":".$_GET["lon"]);
    if (isset($_GET["t"]) && preg_match("/^\d+$/", $_GET["t"])) {
	fwrite($fh, ",\"time\":".$_GET["t"]."}");
    } else {
	fwrite($fh, "}");
    }
    fclose($fh);
    // you should obviously do your own checks before this...
    echo "OK";
} elseif (isset($_GET["tracker"])) {
    // do whatever you want here...
    echo "OK";
} else {
    header('HTTP/1.0 400 Bad Request');
    echo 'Please type this URL in the <a href="https://play.google.com/store/apps/details?id=fr.herverenault.selfhostedgpstracker">Self-Hosted GPS Tracker</a> Android app on your phone.';
}