Unicode string php

I have a question!I want to print an unicode string in php (like '????')!but when I use echo only some ??? apear!!!what whould I do???This happens hen I want to cho string that retrieved from database! \[code\]echo '????';\[/code\]result is:\[code\]????\[/code\]I tried using header function but that didn't help me!
 
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