Re-add old blog posts from Astro

source/_posts/checking-if-user-logged-drupal-right-way.md

@@ -0,0 +1,68 @@
+---
+title: Checking if a user is logged into Drupal (the right way)
+date: 2013-01-09
+excerpt: How to check if a user is logged in by using Drupal core API functions.
+tags:
+    - drupal
+    - drupal-6
+    - drupal-7
+    - drupal-planet
+    - php
+---
+
+I see this regularly when working on Drupal sites when someone wants to check
+whether the current user is logged in to Drupal (authenticated) or not
+(anonymous).
+
+```php
+global $user;
+if ($user->uid) {
+  // The user is logged in.
+}
+```
+
+or
+
+```php
+global $user;
+if (!$user->uid) {
+  // The user is not logged in.
+}
+```
+
+The better way to do this is to use the
+[user_is_logged_in()](http://api.drupal.org/api/drupal/modules!user!user.module/function/user_is_logged_in/7)
+function.
+
+```php
+if (user_is_logged_in()) {
+  // Do something.
+}
+```
+
+This returns a boolean (TRUE or FALSE) depending or not the user is logged in.
+Essentially, it does the same thing as the first example, but there's no need to
+load the global variable.
+
+A great use case for this is within a `hook_menu()` implementation within a
+custom module.
+
+```php
+/**
+ * Implements hook_menu().
+ */
+function mymodule_menu() {
+  $items['foo'] = array(
+    'title' => 'Foo',
+    'page callback' => 'mymodule_foo',
+    'access callback' => 'user_is_logged_in',
+  );
+
+  return $items;
+}
+```
+
+There is also a
+[user_is_anonymous()](http://api.drupal.org/api/drupal/modules!user!user.module/function/user_is_anonymous/7)
+function if you want the opposite result. Both of these functions are available
+in Drupal 6 and higher.