do_shortcode within a shortcode

Question

This may sound a little confusing but I'll try my best to explain. I've made a shortcode that grabs the content of a post (when given the id), it looks like this:

$post_id = $id;
$queried_post = get_post($post_id);
$postcontent = $queried_post->post_content;
$title = $queried_post->post_title;

I then have another variable which puts a few things together and gets returned:

$finaloutput = $title . $postcontent;

What I want to do is be able to run shortcodes withing $postcontent, so when a post is fetched any shortcodes within that post will display. I tried running do_shortcode on the $postcontent variable but it caused the page to literally not load at all.

Any ideas?

Answer 1

You can try this:

add_shortcode( 'content','content_callback' );

function content_callback( $atts, $content = NULL ){
    $atts = shortcode_atts(array(
        'pid' => '',
    ), $atts);      

    if( ! is_int( 1 * $atts['pid'] ) )
        return "<!-- Shortcode Error: pid must be an integer -->"; 

    if(  absint( $atts['pid'] ) === get_the_ID() )
        return "<!-- Shortcode Error: pid can't be the current id -->"; 

    $queried_post = get_post( absint( $atts['pid'] ) );

    if( ! is_object( $queried_post ) )
        return "<!-- Shortcode Error: Post not found! -->";

    $postcontent = do_shortcode( $queried_post->post_content );
    $title = $queried_post->post_title;

    $finaloutput = $title . $postcontent;

    return $finaloutput;
}

where the shortcode is used like this:

[content pid="2069"]

where pid is some post ID.