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    <p>A header is just that, something which appears at the beginning of the data transfer. You are sending data (most of the web page) before trying to send the header.</p> <p>Move your php code to the top of the file, and then just echo the "wrong user/pass" in another php block in the correct location</p> <pre><code>&lt;?php mysql_connect("localhost", "root","******") or die(mysql_error()); mysql_select_db("login") or die(mysql_error()); if(isset($_POST['username']) &amp;&amp; isset($_POST['password'])){ $db_user = mysql_query("SELECT username FROM login_tb"); $db_pass = mysql_query("SELECT password FROM login_tb"); $ctrl_user = mysql_result($db_user,0); $ctrl_pass = mysql_result($db_pass,0); $username = $_POST['username']; $password = $_POST['password']; if(($username || $password) != NULL &amp;&amp; $username == $ctrl_user &amp;&amp; $password == $ctrl_pass){ header("location: ./nextpage.php"); } } ?&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;Uploader&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;form action="index.php" method="POST" enctype="application/x-www-form-urlencoded"&gt; &lt;input id="login" class="username" type="text" name="username" autofocus placeholder="Username" maxlength="30"/&gt; &lt;input id="login" class="password" type="password" name="password" placeholder="Password" maxlength="15"/&gt; &lt;input id="login" class="submit" type="submit" value="Login" /&gt; &lt;p&gt;Last update &lt;span id="lastupdate"&gt;&lt;?php echo date('d-m-Y');?&gt;&lt;/span&gt;&lt;/p&gt; &lt;?php echo $username . $password; if(($username || $password) == NULL){ echo "you have entered wrong username or password! &lt;br/&gt; please contact site admin."; } ?&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. POHow can I redirect to another page in php
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    1. USAndrew Brock
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    1. CODUDE, you just left his nonsense code as is
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      1. USYour Common Sense
    2. CO@YourCommonSense He is trying to learn, and while I agree that his code is not the highest of quality, and has security holes bigger than the Chicxulub crater, I gave the solution to his issue without going into a lecture on security or good coding practices.
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    3. COOMG, it is not "not the highest of quality"! It just doesn't make any sense and will never work. It is not the matter of "security" or "practices". This code will never work. I can't believe you can't see thwt.
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