[PHP] strtoupper and HTML entities

[mweb]

Hello,

I know I can convert a string to all uppercases with the strtoupper()
function. However, what if the original string contains HTML entities?

EXAMPLE:

original string = "funkstörung"
                        contains lowercase o with dieresis (ö)
                        properly displayed by browsers
after strtoupper becomes:
                "FUNKSTÖRUNG" which is displayed by browsers
                                         literally, because capital O with dieresis
                                         is Ö
The uppercase version correctly displayable in a browser should be:

        "FUNKSTÖRUNG

How can I convert to uppercase everything except these entities? Is there a 
straightforward solution, or do I really put together a regex that puts in 
lowercase everything from the second letter after an ampersand to the first 
colon?

                Thanks,

                        mweb
                

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