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I have flashbacks of when my PHP teacher showed us how to turn query parameters into their own variables by using PHP's dynamic variables feature.

He waited a bit, and promptly said to never do that and started to explain the security risks.

Perl is probably worthy of a mention there, with it's taint-mode you're explicitly forced to test externally-influenced variables before using them.

I've seen `eval()` in production code of several applications. The biggest vulnerability is more often than not the programmer :)

But `eval()` does not violate a programmer's intuition as easily as an arithmetic expression resulting in code execution.