Snippets Calendars Dates
Calendars Dates
Calendar Class
by: Konstantin
|
September 6, 2005
Version: 1.0
Type: Class
Category: Calendars/Dates
License: GNU General Public License
Description: Simple class with clear and documented code, which will help you to both to understand the algorithm of the building the calendar and use this idea in your application.
<?php
/**
*Class which contains functions to build Calendar for a definite month
*General algorithm is as following:
*We Build the array of days of month and put 0 where there is no value and then
*display it in a way we want. We can simply display it, we can add news, appointments
* and whatever you like to the every date of the month. The aim oth this class is to show
* how to build the calendar itself, not how to display or work with it
*/
class Calendar
{
/**
*Number of the month for which the calendar is built
*/
var $month;
/**
*Number of the year
*/
var $year;
/**
*Current day. It is used for building the calendar
*/
var $day = 0;
/**
*Maximum days in current month
*/
var $maxday;
/**
*Array of the month's days
*/
var $monthArray = array();
/**
*Constructor of the class. In it we get the shift towards
*current month from address line bye the $_GET method
*Then we sum it with the current month. If the number is greater
* than 12, we add one year and subtract 12 months from the month value
*If the number less than zero, we behave quite opposite - add 12 months
* and subtract one year.
*If everything is OK, we simply put current year in the year property of
*the object
*/
function Calendar()
{
$this->month = date('n')+(integer)$_GET['smon'];
if ( $this->month >12 )
{
$this->month = $this->month - 12;
$this->year = date('Y');
}
else
{
if ( $this->month < 0 )
{
$this->month = 12 + $this->month;//as $this->month<0, we add it
$this->year = date('Y') - 1;
}
else
{
$this->year = date('Y');
}
}
$this->_getMaxDays();
}
/**
*Function calculates number of the days in the month
*@return integer $maxday Result is put to the property of the object
*/
function _getMaxDays()
{
$time=getdate(mktime(0,0,0,$this->month+1, 1, $this->year)-1);
$this->maxday = $time['mday'];
}
/**
*Function builds the week of a definite month
*<p>
*It takes all arguments from the object's properties
*<p>
*It behaves in the following way:
*<p>
* If the value of the current day is zero, then it is the first week of the
* month and we move towards cycling the number of days of the week up to the
* number of the week for the first day of the month. When we reach it, we begin
* to add day of the month to the week array and increment the number of the day
*<p>
* If the Day value is non-zero, then we increment the number of the day and then
* check, if it is less of equal to the maximal value of the day in this month.
* If it is greater, we put zeroes to the week array, otherwise we put number of
* the day
*/
function _buildWeek($begday)
{
if ( $this->day == 0 )
{
for ($i = 0; $i<7; $i++)
{
if ( $i >= $begday )
{
$this->day++;
$week[$i] = $this->day;
}
else
{
$week[$i] = 0;
}
}
}
else
{
for ($i = 0; $i<7; $i++)
{
$this->day++;
if ( $this->day <= $this->maxday )
{
$week[$i] = $this->day;
}
else
{
$week[$i] = 0;
}
}
}
return $week;
}
/**
*Function builds month itself
*It cycles from 0 to 6 weeks (maximum) and builds the array of month's days
*/
function _BuildMonth()
{
/**
*Here if we subtract 1, week will begin with Monday, if we will not, Sunday will
*be the first day
*/
$startday = (integer)strftime('%w', mktime(0,0,0,$this->month, 1, $this->year)) - 1;
for ( $i = 0; $i < 7; $i++ )
{
$this->monthArray[$i] = $this->_buildWeek($startday);
if ( $this->monthArray[$i][6] == 0 )
{
break;
}
}
}
/**
*Function displays the calendar to the user.
*It is only an example. Here we cycle through weeks, then view each day of the week
*If there is not "0", then we display the number, otherwise, we echo
*/
function DisplayMonth()
{
$this->_BuildMonth();
$weeks=sizeof($this->monthArray);
echo "<table>\n";
for ( $i = 0; $i < $weeks; $i++ )
{
echo "<tr>\n";
for ( $j = 0; $j < 7; $j++)
{
echo "<td>\n";
if ($this->monthArray[$i][$j] != 0)
{
echo $this->monthArray[$i][$j]."\n";
}
else
{
echo " \n";
}
echo "</td>\n";
}
echo "</tr>\n";
}
echo "</table>\n";
}
}
?>
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