Could you guys explain me how to get a value back in a case like this...?

Question

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    I Have a line in a program
    P0=fzero(@(P0) estimateSurfacePressure(P0,false,extPar), [1 25]);
and inside estimateSurfacePressure I have 
function [Ps,Rs]=estimateSurfacePressure(P0,isCompressed,extPar)
but inside this file I modify extPar... (extPar is a structure). 
I thought that putting extPar in function [Ps,Rs,extPar] = ....Pressure(P0,isCompressed,extPar)
and modifying P0 to [P0,~,~,~,extPar] = fzero(.........) would give me extPar modified the way I want it to. But it doesn`t! How should I set this up so it gives me extPar not how it came in but how it should be after being modified in estimateSurfacePressure.m