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    <p>The bits about <code>session_start()</code> and <code>session_destroy()</code> do not influence the POST-variables. As BugFinder pointed out, refreshing the page often re-submits whatever data you've just submitted. That's why the 'you're in'-message is presented again.</p> <p>A way of preventing this behaviour is by redirecting after the submitted data has been processed. You could then set a session variable to keep track of the message you still need to display (or, if the user is logged in or not).</p> <p>Your code would look something like this:</p> <pre><code>&lt;?php session_start(); $root = 'root'; mysql_connect('localhost',$root,'') or die(mysql_error()); mysql_select_db("test_create_database") or die(mysql_error()); $result = mysql_query("SELECT * FROM members"); $row = mysql_fetch_assoc($result); $username=""; $password=""; $id=""; if(isset($_POST["submit"])) { if(isset($_POST["submit"]) &amp;&amp; !empty($_POST["username"]) &amp;&amp; !empty($_POST["password"]) &amp;&amp; !empty($_POST["id"])) { if(isset($_POST["username"]) &amp;&amp; isset($_POST["password"]) &amp;&amp; isset($_POST["id"])) { $username = $row["username"]; $password = $row["password"]; $id = $row["id"]; if($username == "John" &amp;&amp; $password =="1234" &amp;&amp; $id =="1") { //do stuff $_SESSION['message'] = "you're in"; } else { $_SESSION['message'] = "you're out!"; } } } elseif (isset($_POST["submit"]) &amp;&amp; (empty($_POST["username"]) || empty($_POST["password"]) || empty($_POST["id"]))) { $_SESSION['message'] = "enter all fields please!!!!"; } $selfLink = $_SERVER['PHP_SELF']; if (isset($_SERVER['QUERY_STRING'])) { $selfLink .= "?" . $_SERVER['QUERY_STRING']; } header('location: '.$selfLink); exit; } if (isset($_SESSION['message'])) { echo $_SESSION['message']; unset($_SESSION['message']); } ?&gt; </code></pre> <p>Note that the redirecting to the page itself seems a bit forced (using <code>$_SERVER['QUERY_STRING']</code> to fetch the current page's location). It works more intuitively if you know the file name or if you're redirecting to a different page after handling form input.</p>
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