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@nomatteus
Created June 28, 2011 21:42
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Sample using very basic XML feed file caching
<?php
/*
* File to convert NextBus' XML Feeds to JSON format
* that our script will use.
*/
// Get route from $_GET['r'] variable, or set to default
// TODO: Add in check for valid route
$route = (isset($_GET['r']) && (int) $_GET['r'] != 0) ? (int) $_GET['r'] : '501';
$filename = "cache/vehicleLocations.".$route.".xml";
// Cache data for X seconds
if (!file_exists($filename) || ((time() - filemtime($filename)) >= 60*60*24)) {
$file_contents = file_get_contents("http://webservices.nextbus.com/service/publicXMLFeed?command=vehicleLocations&a=ttc&r=" . $route . "&t=0");
file_put_contents($filename, $file_contents);
}
$vehicle_locations_xml = simplexml_load_file($filename);
//print_r($vehicle_locations_xml);
$vehicles = array();
foreach ($vehicle_locations_xml->vehicle as $vehicle) {
//print_r($vehicle);
/* Set a simpler direction tag with "N", "S", "E", or "W".
* April 6, 2011 - Direction tags now look like this: 510_0_510A
* Depending on the route (east/west or north/south route), dir tag means:
* _1_ is Westbound OR Northbound
* _0_ is Eastbound OR Southbound
*
* 510 Spadina & 511 Bathurst are only North/South Routes
* The rest are East/West
*/
$dirTag = (string) $vehicle['dirTag'];
$dirTagParts = explode("_", $dirTag);
if (is_array($dirTagParts) && count($dirTagParts) > 1) {
$direction_num = (int) $dirTagParts[1]; // 1 or 0
$routeSub = $dirTagParts[2];
} else {
$direction_num = null;
$routeSub = null;
}
switch($route) {
case 510:
case 511:
if ($direction_num === 0)
$direction = "S";
else if ($direction_num === 1)
$direction = "N";
else
$direction = "null"; //default
break;
case 501:
case 502:
case 503:
case 504:
case 505:
case 506:
case 507:
case 508:
case 509:
case 512:
default:
if ($direction_num === 1)
$direction = "W";
else if ($direction_num === 0)
$direction = "E";
else
$direction = "null"; //default
break;
}
$vehicles[] = array(
// Need to cast attributes to a (string), else it will be treated as an object
'id' => (string) $vehicle['id'],
'lat' => (string) $vehicle['lat'],
'lng' => (string) $vehicle['lon'],
'dirTag' => $dirTag,
'routeSub' => $routeSub,
'dir' => $direction,
'heading' => (string) $vehicle['heading'],
'secsSinceReport' => (string) $vehicle['secsSinceReport']
);
}
$vehicles_json = json_encode(array("vehicles" => $vehicles));
echo $vehicles_json;
?>
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