Untitled

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<html>
    <body>
        <?php
            if(isset($_POST['data']))
                echo $_POST['data'];
            else
            {
        ?>
                <form method="post" action="">
                        Enter something here:<textarea name="data"></textarea>
                        <input type="submit"/>
                </form>
        <?php
            }
        ?>
    </body>
</html>