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Global Variables


WordPress-specific global variables are used throughout WordPress code for various reasons. Almost all data that WordPress generates can be found in a global variable.

Note that it's best to use the appropriate API functions when available, instead of modifying globals directly.

To access a global variable in your code, you first need to globalize the variable with global $variable;

Accessing other globals besides the ones listed below is not recommended.

Inside the Loop variables

While inside the loop, these globals are set, containing information about the current post being processed.

  • $post The whole post object.
  • $authordata (object) Returns an object with information about the author, set alongside the last $post. Object described in Function_Reference/get_userdata.
  • $currentday Day of the post.
  • $currentmonth Month of the post.
  • $page (int) The page of the post, as specified by the query var page.
  • $pages (array)The content pages within a post, which were separated by <!--nextpage--> elements.
  • $multipage (boolean)Returns true if the post has multiple pages, related to $page and $pages.
  • $more (boolean) Returns true if there are multiple pages in the post, related to $page and $pages.
  • $numpages (int) Returns the number of pages in the post, related to $page and $pages.

Browser Detection Booleans

These globals store data about which browser the user is on.

  • $is_iphone (boolean) iPhone Safari
  • $is_chrome (boolean) Google Chrome
  • $is_safari (boolean) Safari
  • $is_NS4 (boolean) Netscape 4
  • $is_opera (boolean) Opera
  • $is_macIE (boolean) Mac Internet Explorer
  • $is_winIE (boolean) Windows Internet Explorer
  • $is_gecko (boolean) FireFox
  • $is_lynx (boolean)
  • $is_IE (boolean) Internet Explorer

Web Server Detection Booleans

These globals store data about which web server WordPress is running on.

  • $is_apache (boolean) Apache HTTP Server
  • $is_IIS (boolean) Microsoft Internet Information Services (IIS)
  • $is_iis7 (boolean) Microsoft Internet Information Services (IIS) v7.x

Version Variables

  • $wp_version (string) The installed version of WordPress
  • $wp_db_version (int) The version number of the database
  • $tinymce_version (string) The installed version of TinyMCE
  • $manifest_version (string) The cache manifest version
  • $required_php_version (string) The version of PHP this install of WordPress requires
  • $required_mysql_version (string) The version of MySQL this install of WordPress requires


  • $super_admins (array) An array of user IDs that should be granted super admin privileges (multisite). This global is only set by the site owner (e.g., in wp-config.php), and contains an array of IDs of users who should have super admin privileges. If set it will override the list of super admins in the database.
  • $wp_query (object) The global instance of the Class_Reference/WP_Query class.
  • $wp_rewrite (object) The global instance of the Class_Reference/WP_Rewrite class.
  • $wp (object) The global instance of the Class_Reference/WP class.
  • $wpdb (object) The global instance of the Class_Reference/wpdb class.
  • $wp_locale (object)
  • $wp_admin_bar (WP_Admin_Bar)
  • $wp_roles (WP_Roles)
  • $wp_meta_boxes (array) Object containing all registered metaboxes, including their id's, args, callback functions and title for all post types including custom.
  • $wp_registered_sidebars (array)
  • $wp_registered_widgets (array)
  • $wp_registered_widget_controls (array)
  • $wp_registered_widget_updates (array)

Admin Globals