get calling function name

[Daniel Kolbo <kolb0057@xxxxxxx>]

Greetings,

is there a way (i swear i saw it in the documentation at one point) to 
get the name of the calling scope (or function) from within another 
function?

eg.

function a() {
   b();
}

function b() {
   echo "the calling function is: " . func_caller();
}

a();

where this would print
the calling function is a
(i made func_caller() up)

I hope this is clear, and i hope there is a quick solution and i just 
can't find it in the documentation.

Thanks,
dk