writing binary data to file

[Davide <davide.chiodi@xxxxxxxx>]

hi,
I must change some bytes in array filled from a msssql text field; now I do:
function adjust (&$ar_in) {
    $ar_in{0}='Ð';
    $ar_in{1}='Ï';
    $ar_in{3}='à';
    $ar_in{4}='¡';
    $ar_in{5}='±';
    $ar_in{7}='á';
}

I've copied/pasted values from an hex editor and this works ok. Question 
is: does exists a more elegant way to do this, using directly hex values 
in the script?
I tried $ar_in{0}=0xFF for example, but when I write on file I got hex 
32 (ascii '2').

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