使用PHP和MySQL从登录用户中提取其他数据

Question

I would like to modify the script below to pull additional information from the database when the user is redirected.

The extra information I want to pull through is in the same table as username and password and is labeled fname. I am very new to php so any help to point me in the right direction would be very much appreciated.

I know I could use the username (and that does work if I replace fname with username in the script on the redirected page) but that is an email so does not look good as a greeting to a logged on user

Here is the script to log in the user and redirect that is working fine:

<?php

session_start();
$host="localhost";  // Host name 
$username="";       // Mysql username 
$password="";       // Mysql password 
$db_name="trydata"; // Database name 
$tbl_name="users";  // Table name

mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB"); 

// username and password sent from form 
$myusername=$_POST['username']; 
$mypassword=$_POST['password']; 

// To protect MySQL injection (more detail about MySQL injection) 
$myusername = stripslashes($myusername); 
$mypassword = stripslashes($mypassword); 
$myusername = mysql_real_escape_string($myusername); 
$mypassword = mysql_real_escape_string($mypassword); 

$sql = "SELECT * 
        FROM $tbl_name 
        WHERE username='$myusername' 
        AND password='$mypassword'"; 
$result = mysql_query($sql); 

// Mysql_num_row is counting table row 
$count = mysql_num_rows($result); 

// If result matched $myusername and $mypassword,
// table row must be 1 row 
if($count == 1){ 
  // Register $myusername, $mypassword
  // and redirect to file"login_success.php" 
  $_SESSION['username'] = $myusername; 
  $_SESSION['password'] = $mypassword; 

  // get the result set from the query
  $result = mysql_fetch_array($result); 

  // get the redirect column's value
  $redirect = trim($result['redirect']);

  if ($redirect == '') {
    echo "No redirect value was set!";
  } else {
    header('Location: ' . $redirect);
    exit;
  }
} else { 
  echo "Wrong Username or Password"; 
} 

?>

Here is the script in the redirected page that is not pulling through the fname from the database:

<?php 

// start up your PHP session! 
session_start();

if ($_SESSION["username"]) {
  echo "You are logged in as ".$_SESSION['fname'];
  echo "<p>";
  echo "<a href='aapage.php'>here is the aapage</a>";
  echo "<a href='logout.php'> Click here to logout<a/>";
} else {
  header ("Location: form.php");
}

?>

Answer 1

First you will need to assign fname to a variable. For example, after the line:

$result = mysql_fetch_array($result);

You can add something like:

$_SESSION['fname'] = $result['fname'];

You can then use this session variable in other pages.