Get prices from Norwegian ST1 petrol stations

I have written some rather rude PHP code to harvest the latest prices from the nearest ST1 petrol station in Norway. I'm not sure what I need it for yet :) but maybe some day Zipato can send me push messages (or Sonos speach) like "Your Aston Martin DB9 (I wish) has less than 30% petrol left. The price is rather good today at 10.50 kr/liter"

As I said, the code is rude, but it works. Here it is in case anybody is interested

1. <?php
2. define(OPPEGARD_STATION_ID, 46125, false); //You need to find the ID of your closest station. Look it up in the URL_STATIONS output
3. define(TEMP_FILENAME, "/var/services/web/last_st1_price.txt", false);
4. define(URL_B95_METER, "https://my.zipato.com/zipato-web/remoting/attribute/set?serial=REMOVED&apiKey=REMOVED&ep=REMOVED&value1=", false); //URL of Zipato meter
5. define(URL_DIESEL_METER, "https://my.zipato.com/zipato-web/remoting/attribute/set?serial=REMOVED&apiKey=REMOVED&ep=REMOVED&value1=", false); //URL of Zipato meter
6. define(URL_STATIONS, "http://st1.notch.no/prices.js", false);
8. $force_update = false;
9. $force_update = $_GET['force']; //You can force an update with ?force=true
11. echo date("Y-m-d H:i:s") . ":"; //Output for my cron-job redirect log
13. $price_b95 = 0.0;
14. $price_diesel = 0.0;
16. $json = GetStationsJSON(URL_STATIONS);
18. foreach($json['stations'] as $station) {
19. if ($station['stationId'] == OPPEGARD_STATION_ID) {
20. $price_b95 = (double) str_replace(",", ".", $station['b95']);
21. $price_diesel = (double) str_replace(",", ".", $station['diesel']);
22. break;
23. }
24. }
26. list($previous_b95, $previous_diesel) = explode(";", ReadPricesFromFile(TEMP_FILENAME));
27. $previous_b95 = (double) str_replace(",",".", $previous_b95);
28. $previous_diesel = (double) str_replace(",",".", $previous_diesel);
31. if (($previous_b95 != $price_b95) || $force_update) { //write to zipato meter only if any of the price has changed
32. UpdateZipatoMeter(URL_B95_METER, $price_b95);
33. WritePricesToFile(TEMP_FILENAME, $price_b95, $price_diesel);
34. echo " p_b: " . $previous_b95 . ", c_b: " . $price_b95;
35. }
36. else {
37. echo " B95: no change"; //for the log
38. }
40. if (($previous_diesel != $price_diesel) || $force_update) { //Wirte to zipato meter only if the price has changed
41. UpdateZipatoMeter(URL_DIESEL_METER, $price_diesel);
42. WritePricesToFile(TEMP_FILENAME, $price_b95, $price_diesel);
43. echo " p_D: " . $previous_diesel . ", c_D: " . $price_diesel; //for the log
44. }
45. else {
46. echo " D: no change"; //for the log
47. }
49. echo "\n"; //newline for the log
52. function GetStationsJSON($stations_url) { //strips JS code and returns JSON
53. $content = file_get_contents($stations_url);
54. $content = str_replace('var prices = \'', '', $content);
55. $content = substr($content, 0, strlen($content)-2); //removing ';' at the end
57. return json_decode($content, true);
58. }
60. function WritePricesToFile($filename, $b95_price, $diesel_price){ //Latest prices are written to file
62. $Handle = fopen($filename, 'w');
63. $Data = $b95_price . ';' . $diesel_price;
64. fwrite($Handle, $Data);
65. fclose($Handle);
66. }
68. function ReadPricesFromFile($filename) {
69. if (!file_exists($filename)) {
70. echo "\nFile " . $filename . "does not exist"; //for logging
71. return "1000.0;1000.0"; //return a high price if no price have been recorded yet
72. }
73. $filehandler = fopen($filename, "r");
74. $contents = fread($filehandler, filesize($filename));
75. fclose($filehandler);
76. return $contents;
77. }
79. function UpdateZipatoMeter($meter_url, $price) {
81. $url = $meter_url . $price;
82. $devnull = file_get_contents($url);
83. }
86. ?>