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Retrieve the current user object.
Will set the current user, if the current user is not set. The current user will be set to the logged-in person. If no user is logged-in, then it will set the current user to 0, which is invalid and won't have any permissions.
$WP_User = wp_get_current_user();
WP_User Current WP_User instance.
File name: wordpress/wp-includes/pluggable.php