web/lib/timezone.inc.php

   1 <?php
   2 set_include_path(get_include_path() . PATH_SEPARATOR . '../lib');
   3
   4 /**
   5  * Generate an associative of the PHP timezones and display text.
   6  *
   7  * @return array PHP Timezone => Displayed Description
   8  */
   9 function generate_timezone_list() {
  10         $php_timezones = DateTimeZone::listIdentifiers(DateTimeZone::ALL);
  11
  12         $offsets = array();
  13         foreach ($php_timezones as $timezone) {
  14                 $tz = new DateTimeZone($timezone);
  15                 $offset = $tz->getOffset(new DateTime());
  16                 $offsets[$timezone] = "(UTC" . ($offset < 0 ? "-" : "+") . gmdate("H:i", abs($offset)) .
  17                         ") " . $timezone;
  18         }
  19
  20         asort($offsets);
  21         return $offsets;
  22 }
  23
  24 /**
  25  * Set the timezone for the user.
  26  *
  27  * @return null
  28  */
  29 function set_tz() {
  30         $timezones = generate_timezone_list();
  31         $update_cookie = false;
  32
  33         if (isset($_COOKIE["AURTZ"])) {
  34                 $timezone = $_COOKIE["AURTZ"];
  35         } elseif (isset($_COOKIE["AURSID"])) {
  36                 $dbh = DB::connect();
  37                 $q = "SELECT Timezone FROM Users, Sessions ";
  38                 $q .= "WHERE Users.ID = Sessions.UsersID ";
  39                 $q .= "AND Sessions.SessionID = ";
  40                 $q .= $dbh->quote($_COOKIE["AURSID"]);
  41                 $result = $dbh->query($q);
  42
  43                 if ($result) {
  44                         $timezone = $result->fetchColumn(0);
  45                 }
  46
  47                 $update_cookie = true;
  48         }
  49
  50         if (!isset($timezone) || !array_key_exists($timezone, $timezones)) {
  51                 $timezone = config_get("options", "default_timezone");
  52         }
  53         date_default_timezone_set($timezone);
  54
  55         if ($update_cookie) {
  56                 $timeout = intval(config_get("options", "persistent_cookie_timeout"));
  57                 $cookie_time = time() + $timeout;
  58                 setcookie("AURTZ", $timezone, $cookie_time, "/");
  59         }
  60 }