Post AND page parameter for WP function

There’s no reason you can’t call add_meta_box() twice in a row and use the same function to display it both times; just change the $post_type parameter.

Example

foreach ( array ( 'post', 'page' ) as $post_type )
{
    add_meta_box( 'your_id', 'your title', 'your_callback', $post_type );
}

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