hello to you all !

this is my first post here, and I am developing my first PHP/mysql project. So please be indulgent 🙂

I have been trying to adapt a script found in Learning PHP5 from OReilly, for displaying a monthly calendar, with 2 comboboxes and a Display button, which allow to select & display a monthly calendar by setting a month and a year.

i added the code that displays a checkbox for every day in the month, so that the user can select multiple dates, then i would like to save these dates to a database.
my code for detecting the checked days is not working.
if someone would have a look and give a suggestion or better a solution to my problem, i would be extremely grateful ! 🙂

the line that generates the checkbox is :

  input_radiocheck('checkbox','mycheckbox[]', $day, $day);

the code that tries to detect the checked boxes is in the process_form() function

<?php
// Use the form helper functions defined in Chapter 6
require 'formhelpers.php';

$months = array(1 => 'January', 2 => 'February', 3 => 'March', 4 => 'April', 
                5 => 'May', 6 => 'June', 7 => 'July', 8 => 'August',
                9 => 'September', 10 => 'October', 11 => 'November', 
                12 => 'December');

$years = array();
for ($year = date('Y') - 1, $max_year = date('Y') + 5; $year < $max_year; $year++) {
    $years[$year] = $year;
}

if ($_POST['_submit_check']) {
    if ($errors = validate_form()) {
        show_form($errors);
    } else {
        show_form();
        process_form();
    }
} else {
    // When nothing is submitted, show the form and then
    // a calendar for the current month
    show_form();
    show_calendar(date('n'), date('Y'));
}

function validate_form() {
    global $months, $years;
    $errors = array();

if (! array_key_exists($_POST['month'], $months)) {
    $errors[] = 'Select a valid month.';
}

if (! array_key_exists($_POST['year'], $years)) {
    $errors[] = 'Select a valid year.';
}

return $errors;
}

function show_form($errors = '') {
    global $months, $years, $this_year;

// If the form is submitted, get defaults from submitted variables
if ($_POST['_submit_check']) {
    $defaults = $_POST;
} else {
    // Otherwise, set our own defaults: the current month and year
    $defaults = array('year' => date('Y'),
                      'month' => date('n'));
}


if ($errors) {
    print 'You need to correct the following errors: <ul><li>';
    print implode('</li><li>',$errors);
    print '</li></ul>';
}

print '<form method="POST" action="'.$_SERVER['PHP_SELF'].'">';
input_select('month', $defaults, $months);
input_select('year',  $defaults, $years);
input_submit('Afficher','Afficher');
input_submit('Enregistrer','Enregistrer');
print '<input type="hidden" name="_submit_check" value="1"/>';
print '</form>';
}

function process_form() {
    // si on a clicke sur afficher
    if (isset($_POST['Afficher'])) {
    show_calendar($_POST['month'], $_POST['year']);
    }
    //sinon, verifier si des dates ont ete selectionnees
    //si oui, enregistrer dans la DB
    //sinon, rien faire

 if (isset($_POST['Enregistrer'])) {
    foreach($_POST['mycheckbox'] as $value){
        echo 'test';
        echo "<BR> You clicked checkbox number " .$value, "\n";
    }
}

}

function show_calendar($month, $year) {
    global $months;
    $weekdays = array('Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa');

// Find the epoch timestamp for midnight on the first day of the month
$first_day = mktime(0,0,0,$month, 1, $year);
// How many days are in the month?
$days_in_month = date('t', $first_day);
// What day of the week (numerically) is the first day of the month?
// You need this to put the first table cell in the right place
$day_offset = date('w', $first_day);


// Print the table header and the row of weekday names
print<<<_HTML_
<table border="0" cellspacing="0" cellpadding="2">
<tr><th colspan="7">$months[$month] $year</th></tr>
<tr><td align="center">
_HTML_;
    print implode('</td><td align="center">', $weekdays);
    print '</td></tr>';


// If the first day of the month is, say, a Tuesday, then you
// need to put blank table cells under "Su" and "Mo" in the first
// row so that the day 1 table cell goes under "Tu"
if ($day_offset > 0) {
    for ($i = 0; $i < $day_offset; $i++) { print '<td>&nbsp;</td>'; }
}

// Print a table cell for each day of the month
for ($day = 1; $day <= $days_in_month; $day++ ) {
    print '<td align="center">' . $day ;
    input_radiocheck('checkbox','mycheckbox[]', $mycheckbox, $day);
    print  '</td>';
    $day_offset++;
    // If this cell was the seventh in the row, then
    // end the table row and reset $day_offset
    if ($day_offset == 7) {
        $day_offset = 0;
        print "</tr>\n";
        // If there are more days to come, then
        // start a new table row
        if ($day < $days_in_month) {
            print '<tr>';
        }
    }
}

// At this point, one table cell has been printed for each day
// of the month. If the last day of the month isn't a Saturday
// then the last row of the table needs to be padded with
// some blank cells out to the end of the row
if ($day_offset > 0) {
    for ($i = $day_offset; $i < 7; $i++) {
        print '<td>&nbsp;</td>';
    }
    print '</tr>';
}
print '</table>';
}
?>

    sorry

    i forgot to add the code for generating a checkbox :

    //print a radio button or checkbox
function input_radiocheck($type, $element_name,
                           $values, $element_value) {
     print '<input type="' . $type . '" name="' .
           $element_name .'" value="' . $element_value . '" ';
     if ($element_value == $values[$element_name]) {
         print ' checked="checked"';
     }
     print '/>';
}
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