PHP: Search An Entire MySQL Database Using PHP

Searching every table in a DB?! Doesn't anyone else see what is wrong with this?

It's purely experimental. One of those, let's see what happens bits of code. Of course searching an entire database is not rational, particularly if you have access to it through a utility like phpMyAdmin. Or to summarize with some text from this post:

"What’s the point you ask? Well, there really isn’t one. With the wide availability of software such as phpMyAdmin, this feature typically exists on web hosts at the get go."