stripBOM example

    function __construct(
        $source, Features $features, $options
    ) {
        $this->features = $features;

        $encoding = isset($options["sourceEncoding"]) ?
                    $options["sourceEncoding"] :
                    null;
        
        //Strip BOM characters from the source         $this->stripBOM($source, $encoding);
        
        //Convert to UTF8 if needed         if ($encoding && !preg_match("/UTF-?8/i", $encoding)) {
            $source = mb_convert_encoding($source, "UTF-8", $encoding);
        }
        
        //Instead of using mb_substr for each character, split the source         //into an array of UTF8 characters for performance reasons         $this->source = Utils::stringToUTF8Array(
            $source,
            !isset($options["strictEncoding"]) || $options["strictEncoding"]
        );