Is Post-Author-Id shortocde

This is pretty straightforward as far as shortcodes go:

function wpse_226998_post_author( $atts, $text ) {
    if ( ! empty( $atts['id'] ) && $atts['id'] == get_the_author_meta( 'ID' ) )
        return $text;
}

add_shortcode( 'post_author', 'wpse_226998_post_author' );

And in practice:

[post_author id="8"]This post is by author ID 8[/post_author]

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