timezone.inc.php

<?php

/*
 * 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
 */

    class TimeZone extends DateTimeZone {
        function get_xml($search) {
            $xml = new DOMDocument('1.0','UTF-8');
            $rootnode=$xml->createElement("zones");

            $zones=$this->listIdentifiers();
            array_unshift($zones, "&nbsp;");
            $len=strlen($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->saveXML();
        }   
        public static function getSelectArray() {
            $zones=self::listIdentifiers();
            array_unshift($zones, "");
            return $zones;
        }
        
        public static function getKey($tz) {
            return array_search($tz,self::getSelectArray());
        }

        public static function createPulldown($name, $value=null, $user=null) {
            $id=preg_replace("/^_+/", "", $name);
            if($value) {
                $text=$value;
            } else {
                $text="";
            }

            if(AUTOCOMPLETE && JAVASCRIPT) {
                $html="<input type=hidden id='" . $id . "' name='" . $name. "'" .
                    " value='" . $value . "'>";
                $html.="<input type=text id='_" . $id . "' name='_" . $name. "'" .
                    " value='" . $text . "' class='autocomplete'>";
            } else {
                $html=create_pulldown("timezone_id", self::getKey($value), self::getSelectArray());
            }
            return $html;
        }


        public static function validate($tz) {
            // Checks if $tz contains a valid timezone string
            $tzones=DateTimeZone::listIdentifiers();
            return array_search($tz, $tzones);
        }

        public static function guess($lat, $lon) {
            if(minimum_version("5.1.2") && class_exists("XMLReader")) {
                $xml=new XMLReader();
                @$xml->open("http://ws.geonames.org/timezone?lat=" . 
                    $lat . "&lng=" . $lon) or $failed=true;
                
                if (!$failed) {
                    while($xml->read() && !$tz) {
                        if($xml->name=="timezoneId") {
                            $xml->read();
                            $tz=$xml->value;
                        }
                    }
                    return $tz;
                } else {
                    $error=error_get_last();
                    log::msg("Could not connect to Geonames site: " . 
                        $error["message"], log::ERROR, log::GENERAL);
                    return null;
                }
            } else {
                return null;
            }

        }    
    }

    class Time extends DateTime {
        function __construct($datetime, $tz=null) {
            try {
                if(TimeZone::validate($tz->getName())) {
                    parent::__construct($datetime,$tz);
                } else {
                    parent::__construct($datetime);
                }
           } catch (Exception $e){
                echo "<b>Invalid time</b><br>";
                log::msg("<pre>" . $e->getMessage() . "</pre>", log::DEBUG, log::GENERAL);
           }
        }
    }



?>