Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Settings.php
public static function setLibXmlLoaderOptions($options)
    {
        if ($options === null && defined('LIBXML_DTDLOAD')) {
            $options = LIBXML_DTDLOAD | LIBXML_DTDATTR;
        }
        self::$libXmlLoaderOptions = $options;
    }
public static function setLibXmlLoaderOptions($options)
    {
        if ($options === null && defined('LIBXML_DTDLOAD')) {
            $options = LIBXML_DTDLOAD | LIBXML_DTDATTR;
        }
        self::$libXmlLoaderOptions = $options;
    }
Set default options for libxml loader.

@param int $options Default options for libxml loader