correctly sort tracks for json output

public/datavelo/index.php

@@ -38,7 +38,7 @@
 }
 closedir($dir);
 
-asort($tracks);
+sort($tracks);
 $known_countries = array();
 $known_country_year = array();
 echo "<table class=\"countries\"><tr>";

public/datavelo/tracklist.json.php

@@ -26,7 +26,7 @@
 }
 closedir($dir);
 $trackliste = [];
-asort($tracks);
+sort($tracks);
 $i = 0;
 foreach ($tracks as $key => $val) {
     $date = substr($val, 0, 10);

public/datavelo/tracks.php

@@ -29,6 +29,7 @@
   }
 closedir($dir);
 
+sort($tracks);
 echo json_encode($tracks); //, JSON_PRETTY_PRINT);
 
 ?>

public/datavelo/velotraces.json.php

@@ -25,6 +25,6 @@
   }
 }
 closedir($dir);
-// asort($tracks);
-echo json_encode($tracks); //, JSON_PRETTY_PRINT);
+sort($tracks);
+echo json_encode($tracks);
 ?>