Insert toc before 2nd h2

The code works fine if i use:
$new_content .= '<span>gg</span>';

But when i try:
$new_content .= '[toc]';

I tried as well:
$new_content .= do_shortcode( '[toc]' );

It doesnt work, i get a white page with no content.

function insert_toc ($content)
{
    if ((!is_singular('post')) || (strpos($content, '<h2') === FALSE) ) {  return $content; }

    $ChapterCount = 2; // Enter the chapter number, which you'd like an add in front of

    $content = explode("<h2", $content);

    $new_content = '';
   
    for ($i = 0; $i < count($content); $i++) {
        if ($i == $ChapterCount) {
            $new_content .= '<span>gg</span>';
        }
       
        if($i>0) {
          $new_content.= "<h2".$content[$i];
        } else {
          $new_content.= $content[$i];
        }
    }
   
    return $new_content;
}
add_filter('the_content', 'insert_toc');

• This topic was modified 4 years, 6 months ago by josede.