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run code in 150+ php & hhvm versions
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<?php printf('%c', 'Федералка'); echo '\xd0\xa4\xd0\xb5\xd0\xb4\xd0\xb5\xd1\x80\xd0\xb0\xd0\xbb\xd0\xba\xd0\xb0';
Output for 4.3.0 - 7.1.0
\xd0\xa4\xd0\xb5\xd0\xb4\xd0\xb5\xd1\x80\xd0\xb0\xd0\xbb\xd0\xba\xd0\xb0