Jsem rád, že se bavíš. Zde je rychlý "startér za 10" :)
<?php
$items = array();
if('POST' === $_SERVER['REQUEST_METHOD']) {
if( ! empty($_POST['item'])) {
$items[] = $_POST['item'];
}
if(isset($_POST['items']) && is_array($_POST['items'])) {
foreach($_POST['items'] as $item) {
$items[] = $item;
}
}
}
?>
<html>
<head>
<title>Demo</title>
</head>
<body>
<?php if($items): ?>
<ul>
<?php foreach($items as $item): ?>
<li><?php echo $item; ?></li>
<?php endforeach; ?>
</ul>
<?php endif; ?>
<form method="post">
<input type="text" name="item" />
<input type="submit" value="Add Item" />
<?php if($items): ?>
<?php foreach($items as $item): ?>
<input type="hidden" name="items[]" value="<?php echo $item; ?>" />
<?php endforeach; ?>
<?php endif; ?>
</form>
</body>
</html>