PHP - UTF-16 to UTF-8(hex) conversion

Question

Is it possible to convert UTF-16
U+610F
style character to UTF-8 (hex)
E6848F
using PHP ?

UTF-8 character is \'意\'

Answer 1

From the comments in the chr man page, one quick hack for turning an ordinal character number into a UTF-8 byte sequence:

function unichr($u) {
    return mb_convert_encoding('&#' . intval($u) . ';', 'UTF-8', 'HTML-ENTITIES');
}

// unichr(0x610F) -> "\xE6\x84\x8F"