在iframe中嵌入wordpress admin

I am trying to embed my wordpress admin in an iframe and it's not working. I tried many solutions such as removing those lines:

add_action( 'login_init', 'send_frame_options_header', 10, 0 );
add_action( 'admin_init', 'send_frame_options_header', 10, 0 );

but not working.

You need use remove_action function:

remove_action( 'login_init', 'send_frame_options_header', 10, 0 );
remove_action( 'admin_init', 'send_frame_options_header', 10, 0 );