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PHP calendar in php


Well-Known Coder
I want to create a calendar in php but it's not working out so well I want to be able to make my < and > buttons work and change the date on top of the calendar with one month. but I I can't get it to work. right now the date on top of the calendar is 08-06-2022 and I don't know why this is the case can someone help me
pic of the calendar

<!-- maandag misschien hierover vragen stellen -->
        include "config.php";
    <!DOCTYPE html>
    <html lang="en">
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <link rel="stylesheet" href="calender.css">
        <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
        <table border='0' >
            // Get the current date
            // //dit hieronder is dus een array maar volgens mij kan het ook anders
            // $date = getdate();

            //$date = date("d-m-Y");
            $date = new DateTime();

            //function for the buttons
            if (isset($_POST['currentMonth'])) {
                // kan zijn dat dit er nog in zou moeten $_POST['currentMonth']
                $date = new DateTime();
            if (isset($_POST['monthBack'])) {
                $date = $date->add(new DateInterval('-1 month'));
            else if (isset($_POST['monthFuture'])) {
                //add 1 month??
                $date = $date->add(new DateInterval('P1W2D'));
            //date for above calender
            $calendarTiming = $date->format('d-m-Y');

            // functie voor de maand
            $currentMonth = $date->format('m');

            //check welk jaar het is
            $year = $date->format('Y');

            // hoeveel dagen zitten er in de maand
            $dagenCheck = cal_days_in_month(CAL_GREGORIAN, $currentMonth, $year);

            echo "<br>";

            echo "<thead>";
            echo "<tr>";
            echo "<th colspan='7'>
                <form method='POST' action=''>
                <input type='hidden' name='currentMonth' value='$currentMonth'>
                    <button type='submit' name='monthBack'>
                        <i class='fa fa-angle-left' style='font-size: 20px;'></i>
                         echo " ".
                    "<button type='submit' name='monthFuture'>
                        <i class='fa fa-angle-right' style='font-size: 20px;'></i>
            echo "</tr>";
            echo "<br>";

            echo '<td style="background-color:#d9d9d9">Ma</td>';
            echo '<td style="background-color:#d9d9d9">Di</td>';
            echo '<td style="background-color:#d9d9d9">Wo</td>';
            echo '<td style="background-color:#d9d9d9">Do</td>';
            echo '<td style="background-color:#d9d9d9">Vr</td>';
            echo '<td style="background-color:#d9d9d9">Za</td>';
            echo '<td style="background-color:#d9d9d9">Zo</td>';

            echo "</thead>";
            echo "<tbody>";
                $id = 1;
                $sql = "SELECT * FROM reserveringen WHERE ID=?";
                $stmt = $conn->prepare($sql);
                $stmt->bind_param("i", $id);
                $result = $stmt->get_result();
                while ($row = $result->fetch_assoc()) {
                    $dbStartDatum = $row['start_datum'];
                    $dbEindDatum = $row['eind_datum'];
                    for ($i = 1; $i <= $dagenCheck; $i++){
                        if ($i == 8){
                            echo "<tr><td>" .$i ."</td>";
                        }elseif($i == 15){
                            echo "<tr><td>" .$i ."</td>";
                        }elseif($i == 22){
                            echo "<tr><td>" .$i ."</td>";
                        }elseif($i == 29){
                            echo "<tr><td>" .$i ."</td>";
                        }elseif($i == $dbStartDatum){
                            echo '<td style="background-color: red;">' .$i .'</td>';
                            echo "<td>" .$i ."</td>";
            echo "</tbody>";