<?php
	echo '
	<form method="POST">
	<textarea name="text" style="width: 500; height: 300">'.
	(isset($_POST['text']) ? htmlspecialchars(str_replace(array("\r", "\n", " "), null, $_POST['text'])) : null)
	.'</textarea><br>
	<input type="submit">
	</form>';
?>