不是这样，但如果在短代码中使用预定义的值或参数作为“标志”，则可以获得相同的结果：

[authoorsposts author="post"]

function wpse_209684_author( $atts ) {
    if ( ! empty( $atts[\'author\'] ) ) {
        $author = $atts[\'author\'];

        if ( $author === \'post\' ) // Our flag, make $author the current post author
            $author = get_the_author_id();
        else // Otherwise just accept a hardcoded author ID
            $author = absint( $author );
    }
}