In this tutorial, we will share about to understanding wordpress global variables with an examples. 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.
To access a global variable in your code, you first need to globalize the variable using global $variable;
$post (WP_Post): The post object for the current post. Object described in WP_Post Class Reference.$posts: Used by some core functions, not to be mistaken for $query->$posts.$authordata (WP_User): The author object for the current post. Object described in WP_User Class Reference.$currentday (string): Day that the current post was published.$currentmonth (string): Month that the curent post was published.$page (int): The page of the current post being viewed. Specified by the query var page.$pages (array): The content of the pages of the current post. Each page elements contains part of the content separated by the <!--nextpage--> tag.$multipage (boolean): Flag to know if the current post has multiple pages or not. Returns true if the post has multiple pages, related to $pages.$more (boolean): Flag to know if WordPress should enforce the <!--more--> tag for the current post. WordPress will not enforce the more tag if true.$numpages (int): Returns the number of pages in the post, related to $pages.$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): Lynx$is_IE (boolean): Internet Explorer$is_edge (boolean): Microsoft Edge$is_apache (boolean): Apache HTTP Server$is_IIS (boolean): Microsoft Internet Information Services (IIS)$is_iis7 (boolean): Microsoft Internet Information Services (IIS) v7.x$is_nginx (boolean): Nginx web server$wp_version (string): The installed version of WordPress$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 WP_Query class.$wp_rewrite (object): The global instance of the WP_Rewrite class.$wp (object): The global instance of the WP environment setup class.$wpdb (object): The global instance of the wpdb class.$wp_locale (object): The global instance of the WP_Locale class.$wp_admin_bar (object): The global instance of the WP_Admin_Bar class.$wp_roles (object): The global instance of the WP_Roles class.$wp_meta_boxes (array): Object containing all registered metaboxes, including their id’s, args, callback functions and title for all post types including custom.$wp_registered_sidebars (array)$wp_registered_widgets (array)$wp_registered_widget_controls (array)$wp_registered_widget_updates (array)$pagenow (string): Used in wp-admin.$post_type (string): Used in wp-admin$allowedposttags (array)$allowedtags (array)$menu (array)Reference: https://developer.wordpress.org/apis/handbook/global-variables/
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