警告通知由函数发出wp_check_post_lock. 如果其他人正在编辑，下面会将用户重定向回post listing屏幕。

add_action( \'load-post.php\', \'redirect_locked_post_wpse_95718\' );

function redirect_locked_post_wpse_95718()
{
    if( isset($_GET[\'post\'] ) && wp_check_post_lock( $_GET[\'post\'] ) )
    {
        global $typenow;
        $goto = ( \'post\' == $typenow ) ? \'\' : "?post_type=$typenow";
        wp_redirect( admin_url( "edit.php$goto" ) );
        exit();
    }
}

foreach( array( \'post\', \'page\' ) as $hook )
    add_filter( "{$hook}_row_actions", \'locked_post_notice_wpse_95718\', 10, 2 );

function locked_post_notice_wpse_95718( $actions, $post ) 
{
    if( wp_check_post_lock( $post->ID ) )
    {
        $actions[\'locked\'] = sprintf(
            \'<span style="color:#f00;font-weight:bolder;">&#149;&#149;&#149; LOCKED %s &#149;&#149;&#149;</span>\',
            strtoupper( $post->post_type )
        );
    }
    return $actions; 
}