do_action( 'wp_before_admin_bar_render' )
Fires before the admin bar is rendered.
The wp_before_admin_bar_render action allows developers to modify the $wp_admin_bar object before it is used to render the Toolbar to the screen.
Please note that you must declare the $wp_admin_bar global object, as this hook is primarily intended to give you direct access to this object before it is rendered to the screen.
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do_action( 'wp_before_admin_bar_render' );