Question

I’ve changed my hosting server from a Windows to a Linux system. But when I run my PHP program, I get this errors:

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/content/p/y/c/francis/html/login/login.php:2) in /home/content/p/y/c/francis/html/login/login.php on line 4

and

 Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/content/p/y/c/francis/html/login/login.php:2) in /home/content/p/y/c/francis/html/login/login.php on line 4

This is the code of my program:

<?php

session_start();

$username  = $_POST['username'];
$password  = $_POST['password'];

if ($username && $password)
{

$connect = mysql_connect(***,***,***);
mysql_select_db("phploginregister") or die("Couldn't find db");

$query = mysql_query("SELECT * FROM users WHERE username='$username'");

$numrows = mysql_num_rows($query);

if ($numrows != 0)
{

    while ($row = mysql_fetch_assoc($query))
    {
    $dbusername = $row['username'];
    $dbpassword = $row['password'];
    }

    //check to see if they match!
    if ($username == $dbusername && md5($password) == $dbpassword)
    {
    echo "You're in! <a href='member.php'>Click</a> here to enter the member page.";
    $_SESSION['username'] = $dbusername;    
    }

    else
        echo "Incorrect password";
}
else
    die("That user doens't exist!");

}
else
    die("Please enter an username and password");



?>

What is wrong in the code, because it workend fine on a Windows host…

Answer 1

You have a leading BOM, new line or other whitespace character before the opening <?php tag.

The errors talk about line 2 and line 4, but in the actual code above session_start() is called on line 3. Therefore, leading whitespace is the problem…