[jrockway]

So, are strings in PHP cstrings, or are they a length/address pair?

[roel_v]

Pascal-style, so size/address. Technically, strings don't need to be null-terminated, but many libraries expect they are so many are 'both' in a way.

[pbiggar]

length/address pair.

[jrockway]

I see. Why is strlen such a hit then?

[pbiggar]

function call overheard. isset is a builtin.