View difference between Paste ID: XKgYZFrN and JqG0CFPT

 <?php
 
 if(isset($_POST['submit'])){
 
-    $error = array();
+
     if (!isset($_POST['email'])) $error[] = "Please fill out all fields";
     if (!isset($_POST['password'])) $error[] = "Please fill out all fields";
 
     $username = $_POST['username'];
 
     if(!$user->isValidUsername($username)){
 		$error[] = 'Usernames must be at least 3 Alphanumeric characters';
 	} else {
 		$stmt = $db->prepare('SELECT username FROM users WHERE username = :username');
 		$stmt->execute(array(':username' => $username));
 		$row = $stmt->fetch(PDO::FETCH_ASSOC);
 
 		if(!empty($row['username'])){
 			$error[] = 'Username provided is already in use.';
 		}
 
 	}
 
 	if(strlen($_POST['password']) < 3){
 		$error[] = 'Password is too short.';
 	}
 
 	if(strlen($_POST['passwordConfirm']) < 3){
 		$error[] = 'Confirm password is too short.';
 	}
 
 	if($_POST['password'] != $_POST['passwordConfirm']){
 		$error[] = 'Passwords do not match.';
     }
 
     $email = htmlspecialchars_decode($_POST['email'], ENT_QUOTES);
 	if(!filter_var($email, FILTER_VALIDATE_EMAIL)){
 	    $error[] = 'Please enter a valid email address';
 	} else {
 		$stmt = $db->prepare('SELECT email FROM users WHERE email = :email');
 		$stmt->execute(array(':email' => $email));
 		$row = $stmt->fetch(PDO::FETCH_ASSOC);
 
 		if(!empty($row['email'])){
 			$error[] = 'Email provided is already in use.';
 		}
 
     }
 
     if(!isset($error)){
 
         $hashedpassword = $user->password_hash($_POST['password'], PASSWORD_BCRYPT);
 
         $activation = md5(uniqid(rand(),true));
 
 		try {
 
             $stmt = $db->prepare('INSERT INTO users (username,password,email,active) VALUES (:username, :password, :email, :active)');
 			$stmt->execute(array(
 				':username' => $username,
 				':password' => $hashedpassword,
 				':email' => $email,
 				':active' => $activation
 			));
             $id = $db->lastInsertId('userID');
 
             $to = $_POST['email'];
 			$subject = "Account Confirmation";
 			$body = "<p>Thank you for signing up\</p>
 			<p>To activate your account, please click on this link: <a href='".DIR."activate.php?x=$id&y=$activation'>".DIR."activate.php?x=$id&y=$activation</a></p>
 			<p>Regards Site Admin</p>";
 
             $mail = new Mail();
 			$mail->setFrom(SITEEMAIL);
 			$mail->addAddress($to);
 			$mail->subject($subject);
 			$mail->body($body);
 			$mail->send();
 
 			//redirect to index page
 			header('Location: index.php?action=joined');
 			exit;
 
 		//else catch the exception and show the error.
 		} catch(PDOException $e) {
 		    $error[] = $e->getMessage();
 		}
 
 		if(!isset($error)){ $error = array(); }
 	}
 
 }
 
 ?>
 <div class="tab-pane" id="registerTab">
-<div class="tab-pane" id=registerTab>
+
         <form role="form" method="post" action="" autocomplete="off">
 
                 <?php
 				if(isset($error)){
 					foreach($error as $error){
 						echo '<p class="bg-danger">'.$error.'</p>';
 					}
 				}
 
 				//if action is joined show sucess
 				if(isset($_GET['action']) && $_GET['action'] == 'joined'){
 					echo "<h2 class='bg-success'>Registration successful, please check your email to activate your account.</h2>";
 				}
 				?>
 
             <div class="form-group">
 				<input type="email" name="email" id="email" class="form-control" placeholder="Email" required="required" value="<?php if(isset($error)){ echo htmlspecialchars($_POST['email'], ENT_QUOTES); } ?>" tabindex="1">
             </div>
             <div class="form-group">
 				<input type="text"  name="username" id="username" class="form-control"placeholder="User Name" required="required" value="<?php if(isset($error)){ echo htmlspecialchars($_POST['username'], ENT_QUOTES); } ?>" tabindex="2">
             </div>
 			<div class="form-group">
 				<input type="password" name="password" id="password"class="form-control" placeholder="Password" required="required" tabindex="3">
             </div>
             <div class="form-group">
 				<input type="password" name="passwordConfirm" id="passwordConfirm" class="form-control" placeholder="Confirm Password" required="required" tabindex="4">
 			</div>
 			<div class="form-group">
 				<button type="submit" name="submit" class="btn btn-primary btn-lg btn-block login-btn" tabindex="5">Register</button>
 			</div>
 		</form>
 	</div>
     <div class="modal-footer">
         <div class="login-footer">
             <span class="login-footer-item">
                 Have an Account? <a href="#registerTab" data-target="#registerTab">Sign in</a>
             </span>
         </div>
     </div>
 </div>