Making a Login Work After Cache, Cookies, etc. Have Been Cleared
- by John
Hello,
I am using the code below for a user login.  The first I try to login after cache / cookies, etc. have been cleared, the browser refreshes and the user name is not logged in.  After that, logging in works fine.  
Any idea how I can make it work the first time?
Thanks in advance,
John
index.php: 
   <?php 
        if($_SERVER['REQUEST_METHOD'] == "POST"){header('Location: http://www...com/.../index.php?username='.$username.'&password='.$password.'');} 
         require_once "header.php"; 
         include "login.php";
         require_once "footer.php";
        ?>
login.php:
<?php
if (!isLoggedIn())
{
    if (isset($_POST['cmdlogin']))
    {
        if (checkLogin($_POST['username'], $_POST['password']))
        {
            show_userbox();
        } else
        {
            echo "Incorrect Login information !";
            show_loginform();
        }
    } else
    {
        show_loginform();
    }
} else
{
    show_userbox();
}
?>
show_loginform function:
function show_loginform($disabled = false)
{
    echo '<form name="login-form" id="login-form" method="post" action="./index.php?'.$_SERVER['QUERY_STRING'].'"> 
    <div class="usernameformtext"><label title="Username">Username: </label></div> 
    <div class="usernameformfield"><input tabindex="1" accesskey="u" name="username" type="text" maxlength="30" id="username" /></div> 
    <div class="passwordformtext"><label title="Password">Password: </label></div> 
    <div class="passwordformfield"><input tabindex="2" accesskey="p" name="password" type="password" maxlength="15" id="password" /></div> 
    <div class="registertext"><a href="http://www...com/.../register.php" title="Register">Register</a></div> 
    <div class="lostpasswordtext"><a href="http://www...com/.../lostpassword.php" title="Lost Password">Lost password?</a></div> 
  <p class="loginbutton"><input tabindex="3" accesskey="l" type="submit" name="cmdlogin" value="Login" ';
    if ($disabled == true)
    {
        echo 'disabled="disabled"';
    }
    echo ' /></p></form>';
}