Fires inside the HTML tag in the admin header. Parameters . ( 2.2.0 ) . . Hook name: admin_xml_ns Hook type: action Plugin ref: WordPress Sourcefile: File ref: _wp_admin_html_begin() – Description: Fires inside the HTML tag in the admin header. Parameters: Deprecated?: No API Letters: A,N,X Invokers 1 to 1 of 1 _wp_admin_html_begin() – Implementers
