Excluding tag Link from html tags in Post content

Your function replaces EVERY tag_name occurence in the content. Meaning, it will replace <h2>my-tag</h2> into <h2><a href="https://wordpress.stackexchange.com/questions/307147/tag-link">my-tag</a></h2>.

I’m assuming you add the tag names to the content manually. Then i would add them with an identifier. For example add the tags to your content like this:

This is my content, i can add tags that transform into links like
this: {tag_name}

Then change your function into:

/**
 * Scan post content and replace {tag_name} with tag link
**/
add_filter( 'the_content', 'post_content_change_my_tags_into_links' );
function post_content_change_my_tags_into_links( $content ) {
  $tags = get_terms( 'post_tag' );
  if ( $tags ) {
    foreach ( $tags as $tag ) {
      $change="{".$tag->name.'}';
      $into = sprintf( '<a href="https://wordpress.stackexchange.com/questions/307147/%s">%s</a>', esc_url( get_term_link( $tag ) ), esc_html( $tag->name ) );
      $content = str_replace($change, $into , $content);
    }
  }
  return $content;
}

NOTE 1: ONLY tags that have posts connected will transform into links.

NOTE 2: be carefull with short function names like link_words() if the function is in the global namespace (directly in functions.php). Duplicate function names will result in an error 500.

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