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<?php
/**
* TimeZone class, extension of the standard PHP DateTimeZone class
* Adds several Zoph-specific timezone-related functions.
*
* This file is part of Zoph.
*
* Zoph is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Zoph is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with Zoph; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* @author Jeroen Roos
* @package Zoph
*/
use conf\conf;
use template\template;
/**
* TimeZone class, extension of the standard PHP DateTimeZone class
*
* @author Jeroen Roos
* @package Zoph
*/
class TimeZone extends DateTimeZone {
/**
* Get an XML document describing all the known timezones
* used to create autocomplete dropdowns
* @param string Partial timezone name to filter timezones
* @return string XML document
*/
public static function getXML($search) {
$xml = new DOMDocument('1.0','UTF-8');
$rootnode=$xml->createElement("zones");
$zones=static::listIdentifiers();
array_unshift($zones, " ");
$len=strlen($search);
foreach ($zones as $id => $tz) {
$tzshort=strtolower(substr($tz,0,$len));
if (strtolower($search)==$tzshort) {
$newchild=$xml->createElement("tz");
$key=$xml->createElement("key");
$title=$xml->createElement("title");
$key->appendChild($xml->createTextNode($id));
$title->appendChild($xml->createTextNode($tz));
$newchild->appendChild($key);
$newchild->appendChild($title);
$rootnode->appendChild($newchild);
}
}
$xml->appendChild($rootnode);
return $xml;
}
/**
* Get array to build html select box
* @return array zones
*/
public static function getSelectArray() {
$zones=static::listIdentifiers();
array_unshift($zones, "");
return $zones;
}
/**
* Get array of timezones with timezone names as key
* @return array zones with names as key
*/
public static function getTzArray() {
$zones=static::getSelectArray();
$zones=array_values($zones);
$zones=array_combine($zones, $zones);
return $zones;
}
/**
* Get Key from timezone name
* @param string timezone
* @return string key
*/
public static function getKey($tz) {
return array_search($tz,static::getSelectArray());
}
/**
* Create Dropdown menu for timezone selection
* @param string name for the html document
* @param string current value
* @return \template\block dropdown
*/
public static function createDropdown($name, $value=null) {
return template::createDropdown("timezone_id", static::getKey($value),
static::getSelectArray());
}
/**
* Validate a timezone name
* @param string Timezone name
* @return bool
*/
public static function validate($tz) {
// Checks if $tz contains a valid timezone string
$tzones=static::listIdentifiers();
return array_search($tz, $tzones);
}
/**
* Guess timezone based on lat & lon
* Uses the geonames project
* @param float latitude
* @param float longitude
* @return string timezone
*/
public static function guess($lat, $lon) {
if (class_exists("XMLReader")) {
$failed=false;
$xml=new XMLReader();
@$xml->open("http://api.geonames.org/timezone?username=zoph&lat=" .
$lat . "&lng=" . $lon) or $failed=true;
if (!$failed) {
while ($xml->read()) {
if ($xml->name=="timezoneId") {
$xml->read();
return $xml->value;
}
}
} else {
$error=error_get_last();
log::msg("Could not connect to Geonames site: " .
$error["message"], log::ERROR, log::GENERAL);
}
return null;
}
}
}
?>
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