Call php from javascript -


i have index.php contains both js , php code. php code reads gps coordinates ios app , js reads these coordinates displayed on web app.

i stuck on figuring out how call php every few seconds can new coordinates. clueless how approach , seems recursion if need call same file purpose.

what best way "refresh" php code , read new coordinates? here code: 

<?php include_once('location.php') ?>  <!doctype html> <html>   <head>     <meta name="viewport" content="initial-scale=1.0, user-scalable=no">     <meta charset="utf-8">     <title>my geolocation</title>     <style>       html, body, #map-canvas {         height: 100%;         margin: 0px;         padding: 0px       }     </style>     <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&signed_in=true"></script>       <script>  var map; google.maps.visualrefresh = true;    function initialize() {   var mylatlng = new google.maps.latlng(<?php echo $current_lat ?>, <?php echo $current_long ?>);   var mapoptions = {     zoom: 14,     center: mylatlng   };    map = new google.maps.map(document.getelementbyid('map-canvas'), mapoptions);    var marker = new google.maps.marker({       position: mylatlng,       map: map,       title: 'hello world!'   });    yourfunction(); }   function yourfunction(){  alert ("<?php echo $current_lat ?>, <?php echo $current_long ?>"); --> here same coordinates   //will add code here display new lat/long once figure out how refresh them       settimeout(yourfunction, 1000); }  google.maps.event.adddomlistener(window, 'load', initialize);      </script>   </head>   <body>     <div id="map-canvas"></div>   </body> </html>  $content = file_get_contents('php://input'); $post_data = json_decode($content , true); $lat = $post_data['lat']; $long = $post_data['long'];  //connect mysql $con1 = mysql_connect("localhost", "aaaaaa", "bbbbbb", "location111"); if ($con1->connect_error) {     die("connection failed: " . $conn->connect_error); }   $db_selected = mysql_select_db('location111'); if (!$db_selected) {     die ('can\'t use foo : ' . mysql_error()); }  if (!empty($lat)) {   $sql = "insert locationinfo (latitude, longitude)                  values ('$lat', '$long');";   mysql_query($sql) or die ('error updating database: ' . mysql_error());  }  $read_query = "select * locationinfo;"; $results = mysql_query($read_query) or die ('error reading database: ' . mysql_error()); $column = array();  while($row = mysql_fetch_array($results)){     $column[] = $row; }  $current_lat = $column[sizeof($column) - 1]['latitude']; $current_long = $column[sizeof($column) - 1]['longitude'];   ?>

you're looking implement ajax.

what separate php code javascript, , make page outputs coordinates.

you call page javascript, , you'll result in variable.

the easiest (but not best you'll come realise) way implement using jquery: http://api.jquery.com/jquery.ajax/

$.ajax("mypageurlhere", {   success: function(data) {     console.log("data: " + data);   },   error: function() {     console.log("error loading data");   } });

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