<form method="post" action="">
	<p>Key to hash: <input type="text" name="key" /> <button type="submit">Submit</button></p>
</form>

<?php
if (isset($_POST['key'])) {
	$key = $_POST['key'];
	echo '<hr /><ul>';
	foreach (hash_algos() as $algo) {
		echo '<li><strong>', $algo, ':</strong> <input type="text" value="', hash($algo, $key), '" onclick="this.select();" /></li>'; 
	}
	echo '</ul>';
} else {
	echo '<p><strong>This will generate hash codes for the following algorithms:</strong> ', implode(', ', hash_algos()), '</p>';
}
?>