PHP and MySQL Cookie and Header doesn't work - php

Question

I have a problem and I hope someone will be able to find a solution.
I just changed hoster and the website doesn't work completely.
Basically the problem is that some code doesn't work.
Where it checks if(!empty($db_password) and ($md5pass == $db_password))
The echo works but the other things don't and it's not only there. I have a similar problem with other files as well.
$username = $_POST['user'];
if(isset($username))
{
$password = $_POST['password'];
$md5pass = md5($password);
$check_user = "SELECT ID,username,password FROM Members ";
$check_user .= "WHERE username = '".$username."'";
$checkuser_query = mysqli_query($dbconnection,$check_user);
while($row = mysqli_fetch_array($checkuser_query,MYSQL_ASSOC))
{
$db_userid = $row['ID'];
$db_username = $row['username'];
$db_password = $row['password'];
$db_avatar = $row['avatar'];
}
if(!empty($db_password) and ($md5pass == $db_password))
{
echo 'you are not awesome.';
setcookie("LoginAuthorised","LoginAuthorised",time()+7200,"/");
setcookie("id",$db_userid,time()+7200,"/");
setcookie("username",$db_username,time()+7200,"/");
header("Location: user.php?value=confirm");
}else
{
echo '<div id="error">Password does not match</div>';
}
}
echo '<p></p><p></p>
<div id="lg_login_form">
<form name="login_form" method="post">
<div id="lg_login_title">Log In</div>
<div id="lg_login_form2">
<label>Username:</label>
<input type="text" name="user" id="username" value="" maxlength="20" />
<label>Password:</label>
<input type="password" name="password" value="" maxlength="20" />
<input name="submit_login" type="submit" value="Log In" id="lg_submit_log" />
<p></p>
<p></p>
<div id="lg_control_text">You have to login to access User Panel</div>
</div>
</form>
<form name="register_redirect" action="user.php?value=register" method="post" id="lg_register_redirect" >
<label>If you want to login you have to register first. Registering takes only a few moments and it gives you multiple features.<br/></label>
<input name="submit_registration" type="submit" value="Register" id="lg_submit_reg_log" />
<p></p>
</form>
</div>';

Answer 1

You're sending headers before setcookie() is called, which is probably why you're having issues. Remove the line that says echo 'you are not awesome.';