Services_JSON::utf82utf16( string $utf8 ): string

242    function utf82utf16($utf8)243    {244        _deprecated_function( __METHOD__, '5.3.0', 'The PHP native JSON extension' );245 246        // oh please oh please oh please oh please oh please247        if($this->_mb_convert_encoding) {248            return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');249        }250 251        switch($this->strlen8($utf8)) {252            case 1:253                // this case should never be reached, because we are in ASCII range254                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8255                return $utf8;256 257            case 2:258                // return a UTF-16 character from a 2-byte UTF-8 char259                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8260                return chr(0x07 & (ord($utf8[0]) >> 2))261                     . chr((0xC0 & (ord($utf8[0]) << 6))262                         | (0x3F & ord($utf8[1])));263 264            case 3:265                // return a UTF-16 character from a 3-byte UTF-8 char266                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8267                return chr((0xF0 & (ord($utf8[0]) << 4))268                         | (0x0F & (ord($utf8[1]) >> 2)))269                     . chr((0xC0 & (ord($utf8[1]) << 6))270                         | (0x7F & ord($utf8[2])));271        }272 273        // ignoring UTF-32 for now, sorry274        return '';275    }