Simple PHP script to test for validity of serialized values

test_serialize.php

<?php $unserialized = null; ?>
<h1><a href="test_serialize.php">Test PHP unserialize</a></h1>
<form action="test_serialize.php" method="post">
	<p>
		Unserialize: <?php
		if (isset($_POST['v'])) {
			$v = unserialize($_POST['v']);
			if ($v) {
				$unserialized = $v;
				echo '<span style="color:green">Success</span>';
			} 
		} ?>
	</p>
	<p>
		<textarea name="v" style="width:800px;height:300px;"><?php if (isset($_POST['v'])) { echo htmlentities(trim($_POST['v'])); } ?></textarea>
	</p>
	<p>
		Length: <?php if (isset($_POST['l'])) { echo strlen(trim($_POST['l'])); } ?>
	</p>
	<p>
		<textarea name="l" style="width:800px;height:150px;"><?php if (isset($_POST['l'])) { echo htmlentities(trim($_POST['l'])); } ?></textarea>
	</p>
	<p><button type="submit">Submit</button></p>
	<?php if ($unserialized) { echo '<p>Unserialized: <pre>'; echo var_export($unserialized, true); echo '</pre></p>'; } ?>
</form>