<?php var_dump(preg_match('//u', "\xef\xbf\xbf")); var_dump(preg_match('//u', "\xf4\x8f\xbf\xbf")); var_dump(preg_match('//u', "\xe0\x80\x80")); var_dump(preg_match('//u', "\xf4\x90\x80\x80"));
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