array_walk: calling functions taking only ONE paramet && calling methods = not possible?

Hi,
I tried to things with array_walk.
1) Calling a function like htmlspecialchars() with array_walk(), but it 
does not work: results in a wrong parameter count in array_walk(), I 
think array_walk() tries to use the numeric key as a second parameter 
for htmlspecialchars(), how do I avoid this.
2) After that I tried to avoid that calling a wrapper method in 
array_walk, I then had to notice that it´s not possible to call methods 
with array_walk();

Either array_walk is missing some functionality or I am missing 
something....

regards


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