When combined, this search finds web pages like:

: A Google search operator that restricts results to those where the specified string appears in the URL.

However, I understand the intent: you want a blog post about using (specifically inurl: , index.php , and id= ) to find vulnerable or poorly secured websites (often for security research or education).

: Learn how to create SEO-friendly permalinks on The Biz Pixie to replace "id=" URLs with readable titles [14].