<?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($_SESSION['tasks']); ?> tasks</h3>
            <h3>your tasks:</h3>
            <ul>
                <?php
                    foreach ($_SESSION['tasks'] as $task) {
                        print '<li>';
                        print htmlspecialchars($task);
                        print '<button>del</button>';
                        print '</li>';
                    }
                ?>
            </ul>

            <br>
            <br>

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


        <?php endif; ?>

      <?php

if(isset($_SESSION[$_GET['delete']])) unset($_SESSION[$_GET['delete']]);

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