echoing function appearing before string

[system]

I’m calling a function into a page which is below, in the function I’m echoing a string followed by another function why do they not display in this order and how can I do this without echoing the out one after another?

Function

echo 'Hello ’ . userInformation(4,0) ;

Result

FredHello

[benanamen]

It would be much more helpful if you post your code.