That’s a trip down memory lane, I once (probably a decade ago by now) had to fix a website built by an unknown developer for a customer. Was wondering why I was missing all kinds of variable assignments, until the word ‘register_globals’ floated up from the depths of my mind. And indeed, they enabled that setting in .htaccess, which broke the website after PHP 5.4 did away with it permanently. But to defend the PHP developers a bit: they turned it off by default in 4.2, which came out in 2002, because they recognised it as a security vulnerability. You can debate if that setting should have sticked around for 13 more years, but at least it required a manual action to actually be able to use it from 4.3. Although I cannot help but wonder how many shared hosting companies turned it on just to prevent all kinds of sites from breaking of course.

And yes, oh boy, the MySQL driver… That one wasn’t great as it didn’t support parameterization, but I guess at least the documentation for mysql_query was clear that any data in your query should be escaped with mysql_real_escape_string. To be fair, if you execute a query containing unescaped data with MySQLi or PDO directly you are going to get Bobby Table’d just as hard.

PHP itself doesn’t have one, it does have a debug command phpinfo() which might print sensitive information. But that’s on the programmer if they called that on a publically available page. Could also be that you meant phpMyAdmin, which is a MySQL webclient built in PHP, not an admin page for PHP itself.