2

So far, I've been able to only consistently hook the_content, appending my plugin at the end. How can I test if the displayed article is not the_content, but an excerpt, and hook my plugin after every the_excerpt?

1

From the codex there are a couple of possible filters for you to try:

Personally I would try the first one with something like:

function fileterExcerpt($excerpt){
    if(has_excerpt()){
        $excerpt .= "Some extra text";
    }
    return $excerpt;
}
add_filter( 'get_the_excerpt', 'filterExcerpt' );

Hope this helps.

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