View code that hurts your brain

[eluser]m4rw3r[/eluser]
From what I remember of a page discussing that with echo and commas, echo was run for every data sent to it.

So this calls echo once:

Code:

echo $firstname.$lastname;

This calls it two times (but in C, so it is still fast):

Code:

echo $firstname, $lastname;

If I recall, this makes commas faster in some instances and slower in others.