[Support request] calling to hook is not working

[Hung]

Hi.

I am trying a simple test in functions.php file.

add_action( 'generate_after_content', 'hp_related_posts' );
function hp_related_posts() {
    
    global $post;
    if ( is_single() ) {
        $output = '<div class="related-posts">';
            $output .= $post->ID;
        $output .= '</div>';
    }
    

    return $output;
}

So, I assumed that before closing of the inside-article div, a new div, related-posts, will appear. However, nothing there when opening any post. Did I do something wrong? Please advice.
Thanks.

[David]

Hi there,

can you share a link to a post in your site where that code should appear ?

[Hung]

I am doing locally, so don’t have an online link yet. But wondering if the above code is having something wrong? In the error server log, there is nothing recorded.

[David]

Right Click > Inspect the Post to open the browser developers tools, in the Elements tab, can you look for the HTML that is added by the function ?

[Hung]

No. That’s why I want to find out the reason.

[David]

Does this work?

add_action( 'generate_after_content', function(){
    echo 'hello world';
});

[Author]

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