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POCannot modify header information - headers already sent
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  1. POCannot modify header information - headers already sent
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    copied!<p>I know that this is well known problem but I've tried all solutions with no avail :(</p> <p>Here is my code: </p> <pre><code>&lt;?php ob_start(); if (!empty($_POST)) { // if submit $username = $_POST['username']; $userpass = $_POST['userpass']; mysql_connect('localhost', 'root', 'root') or die(mysql_error()); mysql_select_db('ita4') or die($connection_error); function login($username, $userpass) { $sqlQuery = "SELECT COUNT(userid) FROM users WHERE name='$username' AND password='$userpass' AND admin='t'"; $runQuery = mysql_query($sqlQuery); return (mysql_result($runQuery, 0) == 1) ? TRUE : FALSE; } if(login($username, $userpass)) { setcookie("username", $username, time()+60*60*24*30); $_COOKIE['username'] = $username; echo "Me:".$_COOKIE['username']; //echo "&lt;script&gt; location.replace('done.html'); &lt;/script&gt;"; } else { echo "&lt;script&gt; alert('Your input data is not found!'); &lt;/script&gt;"; } } ?&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;Login&lt;/title&gt; &lt;link rel="stylesheet" type="text/css" href="style.css"&gt; &lt;meta http-equiv=content-type content="text/html; charset=UTF-8"/&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="upper"&gt; &lt;a href="index.html"&gt;Home&lt;/a&gt; &amp;nbsp;•&amp;nbsp; &lt;a href="login.html"&gt;Login&lt;/a&gt; &amp;nbsp;•&amp;nbsp; &lt;a href="about.html"&gt;About&lt;/a&gt; &lt;/div&gt; &lt;div id="container"&gt; &lt;div id="loginDiv"&gt; &lt;form action="login.php" onsubmit="return checkEmpty()" method="post" name="loginForm"&gt; &lt;table&gt; &lt;tr&gt; &lt;td style="width:100px"&gt;Name: &lt;/td&gt; &lt;td&gt; &lt;input name="username" id="username" type="text" style="width:250px"&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td style="width:100px"&gt;Password: &lt;/td&gt; &lt;td&gt; &lt;input name="userpass" id="userpass" type="password" style="width:250px"&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td colspan="2" style="text-align:center"&gt;&lt;input id="loginImg" type="image" src="images/loginButton.png"&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/form&gt; &lt;/div&gt; &lt;/div&gt; &lt;div id="lower"&gt; &lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt; &lt;p style="text-align:center"&gt;COPYRIGHTS © 2013 &amp;nbsp;&amp;nbsp;•&amp;nbsp;&amp;nbsp; WWW.HISHAM.WS&lt;/p&gt; &lt;/div&gt; &lt;script type="text/javascript"&gt; function checkEmpty() { var username = document.getElementById("username").value; var userpass = document.getElementById("userpass").value; if(username=="" || username==null) { alert("You've to enter your name!"); } else if(userpass=="" || userpass==null) { alert("You've to enter a password!"); } else { return true; } return false; } &lt;/script&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Thanks in advance</p>
 

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