Can we replace PHP language constructs with our own?

Question

PHP allows you to replace or even re-name PHP's built-in functions using functions such as override_function and rename_function.

Can we override the PHP's language constructs like echo and eval?

Answer 1

I don't think it's possible : it's a language construct, which means something that's more than "integrated" to the language : it's really a "part" of the language.