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Thank you, I looked up a solution to my problem. Could you please explain what ob_start(); (thats what fixed my problem) is. I have never used it before. like dummy proof it please

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I dont understand why my header(Location) isnt working. Does any one see why? <?php include 'core/init.php'; logged_in_redirect(); include 'includes/overall/header.php'; if (empty($_POST) === false) { $required_fields = array('first_name', 'last_name', 'username', 'password', 'password_again', 'email'); foreach($_POST as $key=>$value) { if (empty($value) && in_array($key, $required_fields) === true) { $errors[] = 'All field are required'; break 1; } } if (empty($errors) === true) { if (user_exists($_POST['username']) === true) { $errors[] = 'Sorry, the user \'' . $_POST['username'] . '\' is already taken'; } if (preg_match("/\\s/", $_POST['username']) == true) { $errors[] = 'Your username can not have spaces'; } if (strlen($_POST['password']) < 6) { $errors[] = 'Your password must be at least 6 characters long'; } if ($_POST['password'] !== $_POST['password_again']) { $errors[] = 'Your passwords do not match'; } if (filter_var($_POST['email'], FILTER_VALIDATE_EMAIL) === false) { $errors[] = 'A valid email address is required'; } if (email_exists($_POST['email']) === true) { $errors[] = 'Sorry, the email \'' . $_POST['email'] . '\' is already is use. Please contact your site adimn is this is incorrect.'; } } } if (isset($_GET['success']) && empty($_GET['success'])) { echo '<div class="container"><div class="background-success text-center"><div class="alert alert-success center-background">You\'ve be registered successfully! Please check your email to activate your account</div><div class="center-background"><div class="center-text-background">if any issues occur please send us an email!! [email protected]</div></div></div>'; } else { if(empty($_POST) === false && empty($errors) === true) { $register_data = array( 'first_name' => $_POST['first_name'], 'last_name' => $_POST['last_name'], 'username' => $_POST['username'], 'password' => $_POST['password'], 'email' => $_POST['email'], 'email_code' => md5($_POST['username'] + microtime()) ); register_user($register_data); header('Location: register.php?success'); exit(); } ?> <div class="container background"> <form action="" method="POST" class="form-horizontal" role="form"> <div class="form-group"> <label for="inputfirstname3" class="col-sm-2 control-label">First Name</label> <div class="col-sm-10"> <input type="text" name="first_name" class="form-control" id="inputfirstname3" value="" autocomplete="off" placeholder="First Name"> </div> </div> <div class="form-group"> <label for="inputlastname3" class="col-sm-2 control-label">Last Name</label> <div class="col-sm-10"> <input type="text" name="last_name" class="form-control" id="inputlastname3" value="" autocomplete="off" placeholder="Last Name"> </div> </div> <div class="form-group"> <label for="inputusername3" class="col-sm-2 control-label">Username</label> <div class="col-sm-10"> <input type="text" name="username" class="form-control" id="inputusername3" value="" autocomplete="off" placeholder="Username"> </div> </div> <div class="form-group"> <label for="inputemail3" class="col-sm-2 control-label">Email</label> <div class="col-sm-10"> <input type="email" name="email" class="form-control" id="inputemail3" value="" autocomplete="off" placeholder="Email Address"> </div> </div> <div class="form-group"> <label for="inputpassword3" class="col-sm-2 control-label">Password</label> <div class="col-sm-10"> <input type="password" name="password" class="form-control" id="inputpassword3" autocomplete="off" placeholder="Password"> </div> </div> <div class="form-group"> <label for="inputpassword_again3" class="col-sm-2 control-label">Validate Password</label> <div class="col-sm-10"> <input type="password" name="password_again" class="form-control" id="inputpassword_again3" autocomplete="off" placeholder="Validate Password"> </div> </div> <div class="form-group"> <div class="col-sm-10"> <p class="info">Please be aware that this does not mean that you are a member of Better Gamerz United. If you would like to be come a member please contuine with the registration and then fill out our application. Other wise you will have limited use of this site. Thank you Team BGU!! </p> </div> </div> <div class="form-group"> <div class="col-sm-offset-2 col-sm-10"> <button type="submit" class="btn btn-primary pull-right register">Register</button> </div> </div> </form> </div> <?php } include 'includes/overall/footer.php'; ?>