从.txt中提取PHP数据并将其排序为kml

Question

I'm new to javascript and have very little knowledge of PHP. I'm trying to get the data from a google maps route formatted to a KML file. Right now I'm using jquery stringify to save the coördinates of points of the route to a textfile.

Textfile looks like this:

[{"lat":51.101510000000005,"lng":4.948580000000001},{"lat":51.10208,"lng":4.94763},{"lat":51.102160000000005,"lng":4.94744},{"lat":51.102140000000006,"lng":4.944330000000001}]

What I would like to do is get the coördinates of each Lat and Lng and put them in a kml file. Putting them into the file is probably something that I will be able to figure out, but I can't seem to find how I can extract each and every Lat and Lng value.

If I'm Taking a wrong approach by using stringify in JS to save the original array to a text file,please be free to offer a better solution.

Thank you in advance

Here is the code I have at the moment:

PHP

$myfile = fopen("newfile.txt", "w") or die("Unable to open file!");
$txt = $_POST['RoutePath'];
fwrite($myfile, $txt);
fclose($myfile);

Javascript

directionsDisplay.setDirections(response);
console.log(response);
varRoutePath = response.routes[0].overview_path;
console.log(varRoutePath);

xml = JSON.stringify(varRoutePath);
console.log(xml);

function fuDownloadRoute() {
    console.log("fuDownloadRoute");
    console.log(xml);

    $.post('Test.php', { RoutePath: xml },
        function (data) {
            $('#result').html(data);
        });
}

Answer 1

Your coordinates are in JavaScript object notation ( JSON ) format. PHP has a function set for encoding and decoding JSON strings.

In your particular case you might use json_decode() as follows to first convert the text into an array, and then iterate over each coordinate pair:

$myjson = '[{"lat":51.101510000000005,"lng":4.948580000000001},{"lat":51.10208,"lng":4.94763},{"lat":51.102160000000005,"lng":4.94744},{"lat":51.102140000000006,"lng":4.944330000000001}]';
$coordinates = json_decode($myjson, true); // decode into associative array

foreach($coordinates as $pair) {
  echo $pair['lat'] .','. $pair['lng'] . PHP_EOL;
}

Output:

51.10151,4.94858
51.10208,4.94763
51.10216,4.94744
51.10214,4.94433