php unicode 16 bit

how can I append a 16 bit u开发者_StackOverflownicode character to a string in php

$test = "testing" . (U + 199F);

From what I see, \x only takes 8 bit characters aka ascii

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From the manual:

PHP only supports a 256-character set, and hence does not offer native Unicode support.

You could enter a manually-encoded UTF-8 sequence, I suppose.

You can also type out UCS4 as byte sequence and use iconv("UTF-32LE", "UTF-8", $str); to convert it into UTF-8 for further processing. You just can't input the codepoint as a 32-bit code unit in one go.

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Unicode characters don't directly exist in PHP(*), but you can deal with strings containing bytes represent characters in UTF-8 encoding. Here's one way of converting a numeric character code point to UTF-8:

function unichr($i) {
    return iconv('UCS-4LE', 'UTF-8', pack('V', $i));
}

$test= 'testing'.unichr(0x199F);

(*: and ‘16-bit’ Unicode characters don't exist at all; Unicode has code points way beyond U+FFFF. There are 16-bit ‘code units’ in UTF-16, but that's an ugly encoding you're unlikely to meet in PHP.)

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Because unicode is just multibyte and PHP only supports single byte you can create multibyte characters with multiple single bytes :)

$test = "testing\x19\x9F";

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Try:

$test = "testing" . "\u199F";