[nwh]

I'm not quite sure I understand it either, though this does execute phpinfo.

    $variable = "{${phpinfo()}}";
    echo "$variable is fish";

I feel I've missed the point.

[foofoobar]

This is how it is executed:

    $variable = "{${phpinfo()}}"; // <- Execution happens here
    echo "$variable is fish";

If you pass a "{${phpinfo()}}" via GET, it is not executed. The execution has to happen later - e.g. by eval() or /e.

[snapcracker]

Haha same here… anyone care to explain?