Web Development

<?php
//Nothing but the PHP tags can be above this point, not even blank space. ^

if ($_POST['Submit'] == "Submit") {
    
    //If the forms submit button was clicked.
    
    $userid=mysql_real_escape_string($userid);
    $password=mysql_real_escape_string($password);

    if (!$rec = mysql_query("SELECT * FROM `user` WHERE UserName='$userid' AND Password = '$password'")) {echo "Database Maintenance in progress."; exit();}

    if (mysql_num_rows($res) == 1) {
        //Correct Username and password
        header( "Location: http://marhay1.100webspace.net/Login/preupload.php" );
        exit();
    }else{
        //Incorrect username and password.
        echo "Incorrect Username or Password.";
    }
    
    
}
?>

<!-- Form data etc -->

<?php
//Same rules apply for cookies as headers. Nothing above the <?php tags

session_start(); //Start the session. This needs to be at the top of every page that uses the session data.

$_SESSION["example"] = "Hello World"; //Assign the "example" variable to the session array.

?>

<a href="secound_page.php">Click here to go the secound page.</a>

<?php
//Same rules apply for cookies as headers. Nothing above the <?php tags

session_start();

echo $_SESSION["example"]; //If this works it should print "Hello World"

?>

<code>Control ctrl = this.Master.FindControl(textboxID);
TextBox txt = ctrl as TextBox;
if(txt!null)
{
 text = txt.Text;</code>
}

global $GlobalVariable = "<small>In earlier versions of PHP the global variable scope used to include the session array, however that has been disabled for security reasons.</small>";

echo $_SESSION['GlobalVariable']; //This is what is causing the error. It is not necessarily a echo command.