最好的钩子是wp_insert_post_data

function wpse44358_filter_handler( $data , $postarr ){ 
    //do your stuff 
    //if ($data[\'post_author\'] == ...
    return data; // make sure you return something 
}

add_filter( \'wp_insert_post_data\' , \'wpse44358_filter_handler\' , \'99\', 2 );