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I'm trying to insert a div with a small bit of content immediately after the /h2 of single posts. I've given single posts a new class to help trigger this, as I don't want it after the /h2 on a page. I think I need to filter the content but am not sure how to write this function. Any help appreciated. Thanks.

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You're right, you can do that with a filter (the_content). I attached an example. You can put that into the functions.php of your theme.

function add_content_after_h2($content){
    if (is_single()) {
        $div = '<div>small bit of content</div>';
        $content = preg_replace('/(<\/h2>)/i', '\1'.$div, $content);
    }

    return $content;
}

add_filter('the_content', 'add_content_after_h2');

Here you find the Wordpress Codex with a detailed description of that filter: https://codex.wordpress.org/Plugin_API/Filter_Reference/the_content

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