293 lines
14 KiB
PHP
293 lines
14 KiB
PHP
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<?php
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/*********************************************************************************/
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/* Additional functions to use with vtimezone components */
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/*********************************************************************************/
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/**
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* For use with
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* iCalcreator (kigkonsult.se/iCalcreator/index.php)
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* copyright (c) 2011 Yitzchok Lavi
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* icalcreator@onebigsystem.com
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* @version 2.22
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* Additional functions to use with vtimezone components
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*
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* Before calling the functions, set time zone 'GMT' ('date_default_timezone_set')!
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*
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* @author Yitzchok Lavi <icalcreator@onebigsystem.com>
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* adjusted for iCalcreator Kjell-Inge Gustafsson, kigkonsult <ical@kigkonsult.se>
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* @version 1.0.2 - 2011-02-24
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*
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*/
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/**
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* Returns array with the offset information from UTC for a (UTC) datetime/timestamp in the
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* timezone, according to the VTIMEZONE information in the input array.
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*
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* @param array $timezonesarray output from function getTimezonesAsDateArrays (below)
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* @param string $tzid time zone identifier
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* @param mixed $timestamp timestamp or a UTC datetime (in array format)
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* @return array time zone data with keys for 'offsetHis', 'offsetSec' and 'tzname'
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*
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*/
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function getTzOffsetForDate($timezonesarray, $tzid, $timestamp) {
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if( is_array( $timestamp )) {
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//$disp = sprintf( '%04d%02d%02d %02d%02d%02d', $timestamp['year'], $timestamp['month'], $timestamp['day'], $timestamp['hour'], $timestamp['min'], $timestamp['sec'] ); // test ###
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$timestamp = gmmktime(
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$timestamp['hour'],
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$timestamp['min'],
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$timestamp['sec'],
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$timestamp['month'],
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$timestamp['day'],
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$timestamp['year']
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) ;
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}
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$tzoffset = array();
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// something to return if all goes wrong (such as if $tzid doesn't find us an array of dates)
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$tzoffset['offsetHis'] = '+0000';
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$tzoffset['offsetSec'] = 0;
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$tzoffset['tzname'] = '?';
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if( !isset( $timezonesarray[$tzid] ))
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return $tzoffset;
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$tzdatearray = $timezonesarray[$tzid];
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if ( is_array($tzdatearray) ) {
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sort($tzdatearray); // just in case
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if ( $timestamp < $tzdatearray[0]['timestamp'] ) {
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// our date is before the first change
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$tzoffset['offsetHis'] = $tzdatearray[0]['tzbefore']['offsetHis'] ;
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$tzoffset['offsetSec'] = $tzdatearray[0]['tzbefore']['offsetSec'] ;
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$tzoffset['tzname'] = $tzdatearray[0]['tzbefore']['offsetHis'] ; // we don't know the tzname in this case
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} elseif ( $timestamp >= $tzdatearray[count($tzdatearray)-1]['timestamp'] ) {
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// our date is after the last change (we do this so our scan can stop at the last record but one)
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$tzoffset['offsetHis'] = $tzdatearray[count($tzdatearray)-1]['tzafter']['offsetHis'] ;
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$tzoffset['offsetSec'] = $tzdatearray[count($tzdatearray)-1]['tzafter']['offsetSec'] ;
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$tzoffset['tzname'] = $tzdatearray[count($tzdatearray)-1]['tzafter']['tzname'] ;
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} else {
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// our date somewhere in between
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// loop through the list of dates and stop at the one where the timestamp is before our date and the next one is after it
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// we don't include the last date in our loop as there isn't one after it to check
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for ( $i = 0 ; $i <= count($tzdatearray)-2 ; $i++ ) {
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if(( $timestamp >= $tzdatearray[$i]['timestamp'] ) && ( $timestamp < $tzdatearray[$i+1]['timestamp'] )) {
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$tzoffset['offsetHis'] = $tzdatearray[$i]['tzafter']['offsetHis'] ;
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$tzoffset['offsetSec'] = $tzdatearray[$i]['tzafter']['offsetSec'] ;
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$tzoffset['tzname'] = $tzdatearray[$i]['tzafter']['tzname'] ;
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break;
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}
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}
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}
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}
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return $tzoffset;
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}
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/**
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* Returns an array containing all the timezone data in the vcalendar object
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*
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* @param object $vcalendar iCalcreator calendar instance
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* @return array time zone transition timestamp, array before(offsetHis, offsetSec), array after(offsetHis, offsetSec, tzname)
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* based on the timezone data in the vcalendar object
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*
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*/
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function getTimezonesAsDateArrays($vcalendar) {
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$timezonedata = array();
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while( $vtz = $vcalendar->getComponent( 'vtimezone' )) {
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$tzid = $vtz->getProperty('tzid');
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$alltzdates = array();
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while ( $vtzc = $vtz->getComponent( 'standard' )) {
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$newtzdates = expandTimezoneDates($vtzc);
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$alltzdates = array_merge($alltzdates, $newtzdates);
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}
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while ( $vtzc = $vtz->getComponent( 'daylight' )) {
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$newtzdates = expandTimezoneDates($vtzc);
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$alltzdates = array_merge($alltzdates, $newtzdates);
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}
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sort($alltzdates);
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$timezonedata[$tzid] = $alltzdates;
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}
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return $timezonedata;
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}
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/**
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* Returns an array containing time zone data from vtimezone standard/daylight instances
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*
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* @param object $vtzc an iCalcreator calendar standard/daylight instance
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* @return array time zone data; array before(offsetHis, offsetSec), array after(offsetHis, offsetSec, tzname)
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*
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*/
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function expandTimezoneDates($vtzc) {
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$tzdates = array();
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// prepare time zone "description" to attach to each change
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$tzbefore = array();
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$tzbefore['offsetHis'] = $vtzc->getProperty('tzoffsetfrom') ;
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$tzbefore['offsetSec'] = iCalUtilityFunctions::_tz2offset($tzbefore['offsetHis']);
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if(( '-' != substr( (string) $tzbefore['offsetSec'], 0, 1 )) && ( '+' != substr( (string) $tzbefore['offsetSec'], 0, 1 )))
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$tzbefore['offsetSec'] = '+'.$tzbefore['offsetSec'];
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$tzafter = array();
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$tzafter['offsetHis'] = $vtzc->getProperty('tzoffsetto') ;
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$tzafter['offsetSec'] = iCalUtilityFunctions::_tz2offset($tzafter['offsetHis']);
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if(( '-' != substr( (string) $tzafter['offsetSec'], 0, 1 )) && ( '+' != substr( (string) $tzafter['offsetSec'], 0, 1 )))
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$tzafter['offsetSec'] = '+'.$tzafter['offsetSec'];
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if( FALSE === ( $tzafter['tzname'] = $vtzc->getProperty('tzname')))
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$tzafter['tzname'] = $tzafter['offsetHis'];
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// find out where to start from
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$dtstart = $vtzc->getProperty('dtstart');
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$dtstarttimestamp = mktime(
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$dtstart['hour'],
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$dtstart['min'],
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$dtstart['sec'],
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$dtstart['month'],
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$dtstart['day'],
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$dtstart['year']
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) ;
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if( !isset( $dtstart['unparsedtext'] )) // ??
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$dtstart['unparsedtext'] = sprintf( '%04d%02d%02dT%02d%02d%02d', $dtstart['year'], $dtstart['month'], $dtstart['day'], $dtstart['hour'], $dtstart['min'], $dtstart['sec'] );
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if ( $dtstarttimestamp == 0 ) {
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// it seems that the dtstart string may not have parsed correctly
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// let's set a timestamp starting from 1902, using the time part of the original string
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// so that the time will change at the right time of day
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// at worst we'll get midnight again
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$origdtstartsplit = explode('T',$dtstart['unparsedtext']) ;
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$dtstarttimestamp = strtotime("19020101",0);
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$dtstarttimestamp = strtotime($origdtstartsplit[1],$dtstarttimestamp);
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}
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// the date (in dtstart and opt RDATE/RRULE) is ALWAYS LOCAL (not utc!!), adjust from 'utc' to 'local' timestamp
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$diff = -1 * $tzbefore['offsetSec'];
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$dtstarttimestamp += $diff;
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// add this (start) change to the array of changes
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$tzdates[] = array(
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'timestamp' => $dtstarttimestamp,
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'tzbefore' => $tzbefore,
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'tzafter' => $tzafter
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);
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$datearray = getdate($dtstarttimestamp);
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// save original array to use time parts, because strtotime (used below) apparently loses the time
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$changetime = $datearray ;
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// generate dates according to an RRULE line
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$rrule = $vtzc->getProperty('rrule') ;
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if ( is_array($rrule) ) {
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if ( $rrule['FREQ'] == 'YEARLY' ) {
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// calculate transition dates starting from DTSTART
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$offsetchangetimestamp = $dtstarttimestamp;
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// calculate transition dates until 10 years in the future
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$stoptimestamp = strtotime("+10 year",time());
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// if UNTIL is set, calculate until then (however far ahead)
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if ( isset( $rrule['UNTIL'] ) && ( $rrule['UNTIL'] != '' )) {
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$stoptimestamp = mktime(
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$rrule['UNTIL']['hour'],
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$rrule['UNTIL']['min'],
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$rrule['UNTIL']['sec'],
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$rrule['UNTIL']['month'],
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$rrule['UNTIL']['day'],
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$rrule['UNTIL']['year']
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) ;
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}
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$count = 0 ;
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$stopcount = isset( $rrule['COUNT'] ) ? $rrule['COUNT'] : 0 ;
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$daynames = array(
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'SU' => 'Sunday',
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'MO' => 'Monday',
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'TU' => 'Tuesday',
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'WE' => 'Wednesday',
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'TH' => 'Thursday',
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'FR' => 'Friday',
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'SA' => 'Saturday'
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);
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// repeat so long as we're between DTSTART and UNTIL, or we haven't prepared COUNT dates
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while ( $offsetchangetimestamp < $stoptimestamp && ( $stopcount == 0 || $count < $stopcount ) ) {
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// break up the timestamp into its parts
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$datearray = getdate($offsetchangetimestamp);
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if ( isset( $rrule['BYMONTH'] ) && ( $rrule['BYMONTH'] != 0 )) {
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// set the month
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$datearray['mon'] = $rrule['BYMONTH'] ;
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}
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if ( isset( $rrule['BYMONTHDAY'] ) && ( $rrule['BYMONTHDAY'] != 0 )) {
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// set specific day of month
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$datearray['mday'] = $rrule['BYMONTHDAY'];
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} elseif ( is_array($rrule['BYDAY']) ) {
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// find the Xth WKDAY in the month
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// the starting point for this process is the first of the month set above
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$datearray['mday'] = 1 ;
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// turn $datearray as it is now back into a timestamp
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$offsetchangetimestamp = mktime(
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$datearray['hours'],
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$datearray['minutes'],
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$datearray['seconds'],
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$datearray['mon'],
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$datearray['mday'],
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$datearray['year']
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);
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if ($rrule['BYDAY'][0] > 0) {
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// to find Xth WKDAY in month, we find last WKDAY in month before
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// we do that by finding first WKDAY in this month and going back one week
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// then we add X weeks (below)
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$offsetchangetimestamp = strtotime($daynames[$rrule['BYDAY']['DAY']],$offsetchangetimestamp);
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$offsetchangetimestamp = strtotime("-1 week",$offsetchangetimestamp);
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} else {
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// to find Xth WKDAY before the end of the month, we find the first WKDAY in the following month
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// we do that by going forward one month and going to WKDAY there
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// then we subtract X weeks (below)
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$offsetchangetimestamp = strtotime("+1 month",$offsetchangetimestamp);
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$offsetchangetimestamp = strtotime($daynames[$rrule['BYDAY']['DAY']],$offsetchangetimestamp);
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}
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// now move forward or back the appropriate number of weeks, into the month we want
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$offsetchangetimestamp = strtotime($rrule['BYDAY'][0] . " week",$offsetchangetimestamp);
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$datearray = getdate($offsetchangetimestamp);
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}
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// convert the date parts back into a timestamp, setting the time parts according to the
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// original time data which we stored
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$offsetchangetimestamp = mktime(
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$changetime['hours'],
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$changetime['minutes'],
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$changetime['seconds'] + $diff,
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$datearray['mon'],
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$datearray['mday'],
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$datearray['year']
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);
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// add this change to the array of changes
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$tzdates[] = array(
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'timestamp' => $offsetchangetimestamp,
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'tzbefore' => $tzbefore,
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'tzafter' => $tzafter
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);
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// update counters (timestamp and count)
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$offsetchangetimestamp = strtotime("+" . (( isset( $rrule['INTERVAL'] ) && ( $rrule['INTERVAL'] != 0 )) ? $rrule['INTERVAL'] : 1 ) . " year",$offsetchangetimestamp);
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$count += 1 ;
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}
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}
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}
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// generate dates according to RDATE lines
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while ($rdates = $vtzc->getProperty('rdate')) {
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if ( is_array($rdates) ) {
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foreach ( $rdates as $rdate ) {
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// convert the explicit change date to a timestamp
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$offsetchangetimestamp = mktime(
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$rdate['hour'],
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$rdate['min'],
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$rdate['sec'] + $diff,
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$rdate['month'],
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$rdate['day'],
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$rdate['year']
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) ;
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// add this change to the array of changes
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$tzdates[] = array(
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'timestamp' => $offsetchangetimestamp,
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'tzbefore' => $tzbefore,
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'tzafter' => $tzafter
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);
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}
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}
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}
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return $tzdates;
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}
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