Problem with string type

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I try to detect the encoding type of a string $myString which comes
from a html file.
$myString = file_get_contents($myFileName);

Firstly : I tried to get the charset in <meta charset="iso-8859-1">.
But I've the following problem. Internet Explorer write ISO-8859-1 even
if we have save it in Unicode format (UTF-16).

Secondly : Use a algorithm which detect encoding format
w3 has proposed this one which detect utf-8 format

// Returns true if $string is valid UTF-8 and false otherwise.
function is_utf8($string) {

   // From
   return preg_match('%^(?:
         [\x09\x0A\x0D\x20-\x7E]            # ASCII
       | [\xC2-\xDF][\x80-\xBF]            # non-overlong 2-byte
       |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
       | [\xE1-\xEC\xEE\xEF][\x80-\xBF]  # straight 3-byte
       |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
       |  \xF0[\x90-\xBF][\x80-\xBF]    # planes 1-3
       | [\xF1-\xF3][\x80-\xBF]          # planes 4-15
       |  \xF4[\x80-\x8F][\x80-\xBF]    # plane 16
   )*$%xs', $string);

} // function is_utf8


I want the same but foe utf-16 type, does it exist?
mb_detect_encoding($ma_chaine,"UTF-16") doesn't work with utf-16.

The must : detect encoding type without knowing the name and the
version of the navigator.

Thanks a lot.

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