- json_decode: documentation ( source)
- str_replace: documentation ( source)
- json_encode: documentation ( source)
<?php
$text = "%u0410%u043D%u0430%u043B%u043E%u0433%u0438%u0447%u043D%u043E. %u0421%u0434%u0435%u043B%u0430%u0439%u0442%u0435 %u043D%u043E%u0440%u043C%u0430%u043B%u044C%u043D%u0443%u044E %u043D%u043E%u0432%u043E%u0441%u0442%u044C, %u0430 %u043D%u0435 %u0441%u0432%u043E%u0434%u043A%u0443 %u043E %u0414%u0422%u041F";
echo json_decode(str_replace('%u', '\\u', json_encode($text)));
echo unescape($text)
?>