Blank page after logging in

[susanv]

Hello everyone,

I hope someone can help me with this as I'm a bit stumped. I moved my website (everything worked perfectly) to another domain and now something strange happens when I log in.

I type in my username and password (into admin_login.php) and press Enter.
Then a blank page appears (index.php).
When I press the Back button, I'm on the correct page and I'm logged in.

I don't know why the page is blank at first. Does anyone have any ideas?

This is my php code for both pages:

admin_login.php:

<?php 
	session_start();
	if (isset($_SESSION["manager"])) {
    header("location: index.php"); 
    exit();
	}
?>

<?php 
	// Parse the log in form if the user has filled it out and pressed "Log In"
	if (isset($_POST["username"]) && isset($_POST["password"])) {

	$manager = preg_replace('#[^A-Za-z0-9]#i', '', $_POST["username"]); // filter everything but numbers and letters
    $password = preg_replace('#[^A-Za-z0-9]#i', '', $_POST["password"]); // filter everything but numbers and letters

	// Connect to the MySQL database  
    include "../storescripts/connect_to_mysql.php"; 
    $sql = mysql_query("SELECT id FROM admin WHERE username='$manager' AND password='$password' LIMIT 1"); // query the person
  
	// Make sure the person exists in the database
    $existCount = mysql_num_rows($sql); // count the row nums
    if ($existCount == 1) { // evaluate the count
	     while($row = mysql_fetch_array($sql)){ 
             $id = $row["id"];
		 }
		 $_SESSION["id"] = $id;
		 $_SESSION["manager"] = $manager;
		 $_SESSION["password"] = $password;
		 header("location: index.php");
         exit();
    } else {
		echo 'The information is incorrect, please try again. <a href="index.php">Click Here</a>';
		exit();
	}
	}
?>

index.php:

<?php 
	session_start();
	if (!isset($_SESSION["manager"])) {
    header("location: admin_login.php"); 
    exit();
	}

	// Be sure to check that this manager SESSION value is in fact in the database
	$managerID = preg_replace('#[^0-9]#i', '', $_SESSION["id"]); // filter everything but numbers and letters
	$manager = preg_replace('#[^A-Za-z0-9]#i', '', $_SESSION["manager"]); // filter everything but numbers and letters
	$password = preg_replace('#[^A-Za-z0-9]#i', '', $_SESSION["password"]); // filter everything but numbers and letters

	// Run mySQL query to be sure that this person is an admin and that their password session 
	// var equals the database information

	// Connect to the MySQL database  
	include "../storescripts/connect_to_mysql.php"; 
	$sql = mysql_query("SELECT * FROM admin WHERE id='$managerID' AND username='$manager' AND password='$password' LIMIT 1"); // query the person

	// Make sure this person exists in the database
	$existCount = mysql_num_rows($sql); // count the row nums
	if ($existCount == 0) { // evaluate the count
	echo "Your login session data is not on record in the database.";
    exit();
	}
?>

Any help/ideas would be much appreciated.

[StarLion]

Capitalize the L in location? (Sometimes it really is something that silly.)

Also, follow the WPSE steps listed in the "Common PHP Problems" thread at the top of this forum. See if it spits an error out at you.

[susanv]

Thank you very much StarLion, I followed these steps and it fixed the problem:

Place this at the top of your page:
<? ob_start(); ?>

And this at the bottom of your page:
<? ob_flush(); ?>