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493 ddelon 1 
<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4: */
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//
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// +----------------------------------------------------------------------+
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// | PHP Version 4                                                        |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 1997-2002 The PHP Group                                |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 2.02 of the PHP license,      |
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// | that is bundled with this package in the file LICENSE, and is        |
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// | available at through the world-wide-web at                           |
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// | http://www.php.net/license/3_0.txt.                                  |
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// | If you did not receive a copy of the PHP license and are unable to   |
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// | obtain it through the world-wide-web, please send a note to          |
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// | license@php.net so we can mail you a copy immediately.               |
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// +----------------------------------------------------------------------+
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// | Authors: Harry Fuecks <hfuecks@phppatterns.com>                      |
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// +----------------------------------------------------------------------+
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//
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// $Id: Helper.php,v 1.1 2005-09-30 14:58:00 ddelon Exp $
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//
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/**
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 * @package Calendar
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 * @version $Id: Helper.php,v 1.1 2005-09-30 14:58:00 ddelon Exp $
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 */
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/**
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 * Used by Calendar_Month_Weekdays, Calendar_Month_Weeks and Calendar_Week to
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 * help with building the calendar in tabular form
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 * @package Calendar
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 * @access protected
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 */
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class Calendar_Table_Helper
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{
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    /**
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     * Instance of the Calendar object being helped.
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     * @var object
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     * @access private
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     */
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    var $calendar;
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    /**
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     * Instance of the Calendar_Engine
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     * @var object
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     * @access private
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     */
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    var $cE;
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    /**
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     * First day of the week
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     * @access private
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     * @var string
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     */
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    var $firstDay;
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    /**
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     * The seven days of the week named
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     * @access private
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     * @var array
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     */
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    var $weekDays;
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    /**
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     * Days of the week ordered with $firstDay at the beginning
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     * @access private
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     * @var array
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     */
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    var $daysOfWeek = array();
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    /**
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     * Days of the month built from days of the week
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     * @access private
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     * @var array
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     */
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    var $daysOfMonth = array();
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    /**
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     * Number of weeks in month
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     * @var int
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     * @access private
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     */
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    var $numWeeks = null;
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    /**
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     * Number of emtpy days before real days begin in month
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     * @var int
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     * @access private
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     */
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    var $emptyBefore = 0;
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    /**
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     * Constructs Calendar_Table_Helper
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     * @param object Calendar_Month_Weekdays, Calendar_Month_Weeks, Calendar_Week
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     * @param int (optional) first day of the week e.g. 1 for Monday
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     * @access protected
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     */
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    function Calendar_Table_Helper(& $calendar, $firstDay=false)
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    {
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        $this->calendar = & $calendar;
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        $this->cE = & $calendar->getEngine();
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        if ($firstDay === false) {
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            $firstDay = $this->cE->getFirstDayOfWeek(
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                $this->calendar->thisYear(),
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                $this->calendar->thisMonth(),
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                $this->calendar->thisDay()
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            );
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        }
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        $this->firstDay = $firstDay;
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        $this->setFirstDay();
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        $this->setDaysOfMonth();
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    }
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    /**
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     * Constructs $this->daysOfWeek based on $this->firstDay
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     * @return void
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     * @access private
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     */
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    function setFirstDay()
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    {
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        $weekDays = $this->cE->getWeekDays(
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            $this->calendar->thisYear(),
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            $this->calendar->thisMonth(),
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            $this->calendar->thisDay()
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            );
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        $endDays  = array();
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        $tmpDays  = array();
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        $begin = false;
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        foreach ($weekDays as $day) {
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            if ($begin == true) {
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                $endDays[] = $day;
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            } else if ($day === $this->firstDay) {
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                $begin = true;
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                $endDays[] = $day;
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            } else {
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                $tmpDays[] = $day;
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            }
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        }
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        $this->daysOfWeek = array_merge($endDays, $tmpDays);
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    }
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    /**
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     * Constructs $this->daysOfMonth
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     * @return void
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     * @access private
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     */
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    function setDaysOfMonth()
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    {
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        $this->daysOfMonth = $this->daysOfWeek;
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        $daysInMonth = $this->cE->getDaysInMonth(
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            $this->calendar->thisYear(), $this->calendar->thisMonth());
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        $firstDayInMonth = $this->cE->getFirstDayInMonth(
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            $this->calendar->thisYear(), $this->calendar->thisMonth());
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        $this->emptyBefore=0;
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        foreach ($this->daysOfMonth as $dayOfWeek) {
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            if ($firstDayInMonth == $dayOfWeek) {
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                break;
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            }
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            $this->emptyBefore++;
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        }
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        $this->numWeeks = ceil(
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            ($daysInMonth + $this->emptyBefore)
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                /
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            $this->cE->getDaysInWeek(
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                $this->calendar->thisYear(),
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                $this->calendar->thisMonth(),
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                $this->calendar->thisDay()
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            )
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        );
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        for ($i=1; $i < $this->numWeeks; $i++) {
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            $this->daysOfMonth =
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                array_merge($this->daysOfMonth, $this->daysOfWeek);
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        }
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    }
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    /**
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     * Returns the first day of the month
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     * @see Calendar_Engine_Interface::getFirstDayOfWeek()
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     * @return int
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     * @access protected
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     */
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    function getFirstDay()
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    {
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        return $this->firstDay;
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    }
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    /**
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     * Returns the order array of days in a week
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     * @return int
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     * @access protected
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     */
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    function getDaysOfWeek()
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    {
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        return $this->daysOfWeek;
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    }
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    /**
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     * Returns the number of tabular weeks in a month
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     * @return int
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     * @access protected
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     */
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    function getNumWeeks()
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    {
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        return $this->numWeeks;
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    }
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    /**
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     * Returns the number of real days + empty days
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     * @return int
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     * @access protected
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     */
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    function getNumTableDaysInMonth()
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    {
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        return count($this->daysOfMonth);
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    }
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    /**
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     * Returns the number of empty days before the real days begin
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     * @return int
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     * @access protected
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     */
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    function getEmptyDaysBefore()
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    {
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        return $this->emptyBefore;
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    }
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    /**
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     * Returns the index of the last real day in the month
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     * @todo Potential performance optimization with static
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     * @return int
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     * @access protected
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     */
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    function getEmptyDaysAfter()
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    {
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        // Causes bug when displaying more than one month
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//        static $index;
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//        if (!isset($index)) {
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            $index = $this->getEmptyDaysBefore() + $this->cE->getDaysInMonth(
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                $this->calendar->thisYear(), $this->calendar->thisMonth());
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//        }
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        return $index;
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    }
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    /**
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     * Returns the index of the last real day in the month, relative to the
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     * beginning of the tabular week it is part of
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     * @return int
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     * @access protected
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     */
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    function getEmptyDaysAfterOffset()
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    {
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        $eAfter = $this->getEmptyDaysAfter();
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        return $eAfter - (
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            $this->cE->getDaysInWeek(
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                $this->calendar->thisYear(),
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                $this->calendar->thisMonth(),
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                $this->calendar->thisDay()
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            ) * ($this->numWeeks-1) );
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    }
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    /**
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     * Returns the timestamp of the first day of the current week
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     */
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    function getWeekStart($y, $m, $d, $firstDay=1)
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    {
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        $dow = $this->cE->getDayOfWeek($y, $m, $d);
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        if ($dow > $firstDay) {
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            $d -= ($dow - $firstDay);
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        }
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        if ($dow < $firstDay) {
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            $d -= (
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                $this->cE->getDaysInWeek(
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                    $this->calendar->thisYear(),
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                    $this->calendar->thisMonth(),
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                    $this->calendar->thisDay()
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                ) - $firstDay + $dow);
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        }
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        return $this->cE->dateToStamp($y, $m, $d);
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    }
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}
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?>