Question

So I am making a calender form for a client to choose a course to book… this then uploads to a link table between the course and the customer but I cant for the life of me get the calender into a calender like grid properly… my code is simple and sweet but i need to do this non object orientated (i have small java experience but nothing else)….

I have ben staring at this all day but to no avail!

(I am learning so im not going down the routes of protecting it etc… this is for self learning so just needs to work and help me understand where I am going wrong)

The code:

<?
if(@$_POST['month'])
{    
$_SESSION['month'] = trim($_POST['month']);
}

elseif(!isset($_SESSION['month']))
{    
$_SESSION['month'] = '3';
}

if(@$_POST['year'])
{    
$_SESSION['year'] = trim($_POST['year']);
}

elseif(!isset($_SESSION['year']))
{    
$_SESSION['year'] = '2012';
}

?>

<form name="sort" action="calender.php" method="post">
<select name="month">
    <option value="1">January</option>
    <option value="2">February</option>
    <option value="3">March</option>
    <option value="4">April</option>
    <option value="5">May</option>
    <option value="6">June</option>
    <option value="7">July</option>
    <option value="8">August</option>
    <option value="9">September</option>
    <option value="10">October</option>    
    <option value="11">November</option>
    <option value="12">December</option>
</select>
<select name="year">
    <option value="2012">2012</option>
    <option value="2013">2013</option>
    <option value="2014">2014</option>
    <option value="2015">2015</option>
    <option value="2016">2016</option>
    <option value="2017">2017</option>
    <option value="2018">2018</option>
    <option value="2019">2019</option>
    <option value="2020">2020</option>
    <option value="2021">2021</option>
    <option value="2022">2022</option>
    <option value="2023">2023</option>
</select>
<input type="submit" value=" - !Go! - " />
</form><br />
<?php



$month = $_SESSION['month'];
$year = $_SESSION['year'];
$day = 1;

$nummonth = cal_days_in_month(CAL_GREGORIAN, $month, $year);

echo "<form name='choosedate' action='datechosen' method='get'>";

for($day = 1; $day <= $nummonth; $day++)
{

echo $day."/".$month."/".$year."<input type='radio' name='coursedate value='".$day."-".$month."-".$year."' /><br />";

}

echo "<input type='submit' value=' - Submit - ' /></form>";

?>

Thank you for any help you can give… any advice or even just a point in the right direction is much much much appreciated!

Answer 1

Here’s a function I threw together that should work with your current code. To use the function, simply call it by this:

# $month, $year must be numeric.  ie. Aug = 8
# The 3rd parameter is optional.  It will display the calendar month starting 
# on either Monday or Sunday, depending on your preference.  Default is 'sun',
# but anything other than 'sun' will cause the displayed week to start on Monday.

printCalendarMonth($month, $year, 'mon'); 

Then you need to include the code below. I’ve commented in it to help.

function printCalendarMonth($month, $year, $firstDay = 'sun')
{
    # Get the number of days in the month
    $totalDays = cal_days_in_month(CAL_GREGORIAN, $month, $year);
    # Get the day-of-the-week the 1st starts on
    $date = getDayOfTheWeek($month,$year, $firstDay);
    # print out the table headers
    printTableHeader($date, $firstDay);
    # print table body
    printTableBody($totalDays, $date['startDay']);
    # print out the table headers
    printTableFooter();

}

function printTableHeader($date, $firstDay)
{
    # The standard "Sunday First" calendar of days
    $days = array('Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'); 
    # change to the "Monday First" calendar
    if($firstDay == 'mon'){
        # the days of the week
        $days = array('Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'); 
    }
    # print the header HTML for the calendar table
    echo '<h1>' . $date['month'] . ', ' . $date['year'] . '</h1>' . "\n";
    echo '<table>' . "\n";
    echo "\t" . '<thead>' . "\n";
    echo "\t\t" . '<tr>' . "\n";
    # loop through the days and print them out
    foreach($days as $day){
        echo "\t\t\t" . '<th>' . $day . '</th>' . "\n"; 
    }
    # close table header HTML
    echo "\t\t" . '</tr>' . "\n";
    echo "\t" . '</thead>' . "\n";
    echo "\t" . '<tbody>' . "\n";
}

function printTableBody($totalDays, $startDay)
{
    # value to represent the day the last day of the month falls on
    $endDay = 6;
    # value to represent the current day of the week
    $currDay = 1;
    # Loop through all the days of the month
    for($todayDate=1; $todayDate <= $totalDays; $todayDate++){
        # start a new row every 7 days
        if($currDay % 7 == 1) { echo "\t\t" . '<tr>' . "\n"; }
        # increment the current day (do this before the closing table row)
        $currDay++;
        # loop through the number of starting days to represent the days of the previous month
        $currDay = printPrevMonthDays($startDay, $currDay);
        # print out the table cell for this day.  Start a new row for every 7 days
        echo "\t\t\t" . '<td>'.$todayDate.'</td>' . "\n";
        # close the table row every 7 days
        if($currDay % 7 == 1) { echo "\t\t" . '</tr>' . "\n"; }
    }
}

function printTableFooter($firstDay)
{
    echo "\t" . '</tbody>' . "\n";
    echo '</table>' . "\n";
}

function getDayOfTheWeek($month, $year, $firstDay = 'sun')
{
    $date = array();
    # save out the date values
    $time = mktime(0, 0, 0, $month, 1, $year);
    $date['dotw'] = strtolower( date("D", $time) );
    $date['month'] = strtolower( date("F", $time) );
    $date['year'] = strtolower( date("Y", $time) );

    switch($date['dotw']){
        default:
        case 'sun': $date['startDay'] = 0; break;
        case 'mon': $date['startDay'] = 1; break;
        case 'tue': $date['startDay'] = 2; break;
        case 'wed': $date['startDay'] = 3; break;
        case 'thu': $date['startDay'] = 4; break;
        case 'fri': $date['startDay'] = 5; break;
        case 'sat': $date['startDay'] = 6; break;
    }
    # subtract one if we want to display Monday as the first day of the week
    if($firstDay == 'mon')
        $date['startDay'] = $date['startDay'] - 1;
    # return date array object
    return $date;
}

# passing startDay by reference
function printPrevMonthDays(&$startDay, $currDay)
{
    while($startDay != 0){
        echo "\t\t\t" . '<td>[blank]</td>' . "\n";  
        # increment the current day
        $currDay++;
        # decrement the startDay
        $startDay--;    
    }
    # return zero to 
    return $currDay;
}

The main concept is as DaveyBoy states, it’s just a X-by-X array. The only real trick is that days don’t always start on the first day of the week, so you need to print out some “blank” days of the previous month.

You could easily do this by creating a 7-by-X 2D array and just loop through that, but it will be the same concepts where you need to fill in the blank spaces.

Of course, there’s some hard coded values in there, which can be improved upon but for the sake of this tutorial, here it is.

Hope it helps!
Cheers!