How does php read the encoding of text?

This article mainly introduces the relevant information about the encoding of PHP detection text. Friends who need it can refer to it

Judge whether it belongs to the encoding by a loop encoding of the text. .

public function chkCode($string) {
    $code = array(
      'ASCII',
      'GBK',
      'UTF-8'
    );
    foreach ($code as $c) {
      if ($string === iconv('UTF-8', $c, iconv($c, 'UTF-8', $string))) {
        return $c;
      }
    }
    return null;
  }

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