GPS-Logger/gps_ajax.php

<?php
ini_set("display_errors", "0");
//error_reporting(E_ALL);
date_default_timezone_set('UTC');
require("connection.php");
// Opens a connection to a MySQL server
$db = new PDO("mysql:host=$dbhost;dbname=$db;charset=utf8mb4", $dbuser, $dbpass);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);

$cache_file = "data.txt";

$query = "SHOW TABLE STATUS FROM arduino LIKE 'markers'";
$stmt = $db->query($query);
$row = $stmt->fetch(PDO::FETCH_ASSOC);
	
if (file_exists($cache_file) && strtotime($row['Update_time']) <= filemtime ($cache_file)) {
	
	header("Location: $cache_file?cache=" . filemtime ($cache_file));
	die();

} else {
	// Select all the rows in the markers table
	$query = "SELECT * FROM markers ORDER BY timestamp";
	$stmt = $db->query($query);
	// Iterate through the rows, adding XML nodes for each
	while($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
		$row['lat'] = doubleval($row['lat']);
		$row['lng'] = doubleval($row['lng']);
		$row['alt'] = floatval($row['alt']);
		$row['hdop'] = intval($row['hdop']);
		$row['timestamp'] = strtotime($row['timestamp']);
		//$row['format'] = date('d.m.Y H:i:s', $row['timestamp']);
		$json[] = $row;
	}

	$txt=json_encode($json);
	file_put_contents($cache_file, $txt, LOCK_EX);
	echo $txt;
}



?>