is_user_logged_in() not working in wordpress plugin

4 comments

1. is_user_logged_in() is located in wp-includes/pluggable.php. So please include this file in your plugin file and check.

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2. Try with

   $user = wp_get_current_user();
   if($user->ID != 0 or $user->ID != null) ...
   

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3. Plugins are loaded prior to pluggable.php, which is where is_user_logged_in() is located. Which means the function doesn’t exist yet when you’re trying to call it. Instead, do this:

   add_action('init', 'ajax_auth_init');
   function ajax_auth_init()
   {
       if(!is_user_logged_in()) return;
       // rest of your code
   }
   

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4. function example_function() {
       if ( ! is_user_logged_in() ) {
           ajax_auth_init();
       }
   }
   add_action('init', 'example_function');
   

   EDIT:

   is_user_logged_in() is a pluggable function and you could get a fatal error if you call it too early.
   You can use this function inside your theme files without any additional code. Like:

   <?php if ( is_user_logged_in() ) { ?>
       <a href="<?php echo wp_logout_url(); ?>">Logout</a>
   <?php } else { ?>
       <a href="/wp-login.php" title="Members Area Login" rel="home">Members Area</a>
   <?php } ?>
   

   But inside plugin you should wait for wordpress to be loaded.

   P.S. Sorry for my english.

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