Untitled

Form post security. Making sure it did not come from outside source
<form action="<?php echo $_SERVER['REQUEST_URI']; ?>" method="POST">
    <input type="text" name="post" id="post" />
    <input type="submit" name="submit" id="submit" />
 </form>

<?php
    session_start(); // don't forget that you need to call before output (place first, or use ob_start()
    $_SESSION['formhash'] = md5(date('Y-m-d H:i:s').'2fiaSFI#T8ahugi83okkj');
?>
<form action="<?php echo $_SERVER['REQUEST_URI']; ?>" method="POST">
<input type="text" name="post" id="post" />
<input type="hidden" name="hash" id="hash" value="<?php echo $_SESSION['formhash']; ?>" />
<input type="submit" name="submit" id="submit" />
</form>

<?php
    session_start(); // don't forget that you need to call before output (place first, or use ob_start()
    if (isset($_SESSION['formhash']) && isset($_POST['hash']) && $_SESSION['formhash']==$_POST['hash']) {
        // treat $_POST
    }
?>