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<?php $town = "to\xc4\x84wn"; var_dump($town, str_replace("\xc4\x84", "ą", $town)); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(6) "toĄwn" string(6) "toąwn"