[SeoxyS]

There's nothing inherently wrong about using the PHP language or the MySQL RDBMS to build a secure website. Most of the terrible code on the internet is in PHP/MySQL, and most of the PHP/MySQL code is terrible—but that is not a deficiency of the language, but rather a consequence of its ease of use and popularity.

That, though, in no way means that you can't build a good, secure website on the LAMP stack.

It's just a (rather obvious) fact that if you're a bad developer, then you're going to build an insecure site, most likely on LAMP. If you're a good developer, you're probably going to build a good site, which might be on a less common platform, but equally as (or more) likely on LAMP, too.