In case you don’t have iconv and mbstring, you might use below function to convert UTF-8 to TIS-620.

function utf8_to_tis620($string) {
  $str = $string;
  $res = "";
  for ($i = 0; $i < strlen($str); $i++) {
    if (ord($str[$i]) == 224) {
      $unicode = ord($str[$i+2]) & 0x3F;
      $unicode |= (ord($str[$i+1]) & 0x3F) << 6;
      $unicode |= (ord($str[$i]) & 0x0F) << 12;
      $res .= chr($unicode-0x0E00+0xA0);
      $i += 2;
    } else {
      $res .= $str[$i];
    }
  }
  return $res;
}

Read more at Convert TIS-620 to UTF-8 in PHP.

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