- json_decode: documentation ( source)
- str_replace: documentation ( source)
- json_encode: documentation ( source)
<?php
$text = "%u0423%u0432%u0430%u0436%u0430%u0435%u043C%u044B%u0435";
echo json_decode(str_replace('%u', '\\u', json_encode($text)));
echo unescape($text)
?>