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function utf16urlencode ($str) { $str = mb_convert_encoding ($str, 'UTF-16', 'UTF-8'); $out = ''; for ($i = 0; $i < mb_strlen($str, 'UTF-16'); $i++) { $out .= '%u'.bin2hex(mb_substr($str, $i, 1, 'UTF-16')); } return $out; }