How do I echo username in profile page with PHP?

问题

So I want to echo the users' "username" on their profile. It's not working when I user this piece of code. why? Help please i echo'ed this on my page <?php echo "<td>" . $row['username'] . "</td>";?> but didn't work

<?php
if (!session_id()) session_start();
if (!$_SESSION['logon']){ 
    header("Location:login.php");
    die();
}
$con = mysql_connect("localhost","root","");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

mysql_select_db("test", $con);

$result = mysql_query("SELECT * FROM `users` where username='$username'");
while($row = mysql_fetch_array($result))
$username = $row['username'];
?>

回答1:

Try <?php echo $username; ?>

回答2:

Try mysql_fetch_assoc function without while loop:

$row = mysql_fetch_assoc($result);

<?php echo "<td>" . $row['username']; . "</td>"; ?>

来源：https://stackoverflow.com/questions/24584165/how-do-i-echo-username-in-profile-page-with-php