Warning: Cannot modify header information - headers already sent [duplicate]

Answer 1

You've been had by the utf8 BOM

Basically your file has some strange characters at the beginning of the file to mark it as utf8. This is called a Byte Order Mark and is not shown in most editors but is output by php

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Answer 2

Check if you have a whitespace or empty line before <? header("Content-type: text/html; charset=utf-8"); and remove it.