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If you have a block that you want to set visible only for logged in users, follow these easy steps:
- Go to Administration -> Build -> Blocks page;
- Select "Configure" link next to the name of the block that you want to set visible only for logged in users;
- After the page reloads scroll down to the "Page specific visibility settings" field, select "Show if the following PHP code returns TRUE (PHP-mode, experts only)" option and paste the following code in the field "Pages" showed below the selection options:
<?php global $user; return (bool) $user->uid; ?>
To display the block only for anonymous users use the following code:
<?php global $user; return !(bool) $user->uid; ?>
Note: to use this method the PHP filter module must be enabled!