html[todos.php]

<?php session_start(); ?>
<!DOCTYPE html>
<html>
    <head>
        <title>simple to-do list</title>
    </head>
    <body>
        <form action="form.php" method="POST">
            <h2>task name:</h2>
            <input name="task" />
            <br>
            <button>save</button>
        </form>

        <?php if (count($_SESSION['tasks']) == 0): ?>

            <br>you have no tasks

        <?php else: ?>

            <h3>you have: <?php echo count($_SESSION['tasks']); ?> tasks</h3>
            <h3>your tasks:</h3>
            <ul>
                <?php

                    if(isset($_GET['del'])) {
                        $delete_key = $_GET['del'];
                        if(isset($_SESSION['tasks'][$delete_key])) {
                            unset($_SESSION['tasks'][$delete_key]);
                        }
                    } ?>

                    <ul>
                    <?php foreach ($_SESSION['tasks'] as $key => $value) {
                     echo "<li>{$value} <a href=\"{$_SERVER['PHP_SELF']}?del={$key}\">[Del]</a></li>";
                    } ?>
                    </ul>

            </ul>

            <br>
            <br>

            <a href="clear.php">remove all my tasks</a>


        <?php endif; ?>

    </body>
</html>