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Description

convert a string from one UTF-8 char to one UTF-16 char

Normally should be handled by mb_convert_encoding, but provides a slower PHP-only method for installations that lack the multibyte string extension.

Usage

Services_JSON::utf82utf16( $utf8 );

Parameters

$utf8

( string ) required – UTF-8 character

Returns

void string UTF-16 character

Source

File name: wordpress/wp-includes/class-json.php
Lines:

    function utf82utf16($utf8)
    {
        _deprecated_function( __METHOD__, '5.3.0', 'The PHP native JSON extension' );

        // oh please oh please oh please oh please oh please
        if($this->_mb_convert_encoding) {
            return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
        }

        switch($this->Services_JSON::strlen8($utf8)) {
            case 1:
                // this case should never be reached, because we are in ASCII range
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return $utf8;

            case 2:
                // return a UTF-16 character from a 2-byte UTF-8 char
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return chr(0x07 & (ord($utf8[0]) >> 2))
                     . chr((0xC0 & (ord($utf8[0]) << 6))
                         | (0x3F & ord($utf8[1])));

            case 3:
                // return a UTF-16 character from a 3-byte UTF-8 char
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return chr((0xF0 & (ord($utf8[0]) << 4))
                         | (0x0F & (ord($utf8[1]) >> 2)))
                     . chr((0xC0 & (ord($utf8[1]) << 6))
                         | (0x7F & ord($utf8[2])));
        }

        // ignoring UTF-32 for now, sorry
        return '';
    }
 

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