made auto phpcbf changes; added some documentation

views/auth/register.php

@@ -10,13 +10,13 @@ if (isset($_SESSION['user_id'])) {
 $error = $_SESSION['error'] ?? '';
 unset($_SESSION['error']); // Clear the error after displaying
 
-$content = function() use ($error) { ?>
+$content = function () use ($error) { ?>
     <div class="row justify-content-center">
         <div class="col-md-6">
             <h2 class="mt-5">Register</h2>
-            <?php if ($error): ?>
+            <?php if ($error) : ?>
                 <div class="alert alert-danger" role="alert">
-                    <?= htmlspecialchars($error) ?>
+                    <?php echo htmlspecialchars($error) ?>
                 </div>
             <?php endif; ?>
             <form action="/register" method="post">
@@ -39,4 +39,4 @@ $content = function() use ($error) { ?>
     </div>
 <?php };
 
-include __DIR__ . '/../layouts/app.php';
+require __DIR__ . '/../layouts/app.php';