Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Reader/Xlsx.php
private function getFromZipArchive(ZipArchive $archive, $fileName = '')
    {
        // Root-relative paths
        if (strpos($fileName, '//') !== false) {
            $fileName = substr($fileName, strpos($fileName, '//') + 1);
        }
        $fileName = File::realpath($fileName);

        // Sadly, some 3rd party xlsx generators don't use consistent case for filenaming
        //    so we need to load case-insensitively from the zip file

        // Apache POI fixes
        $contents = $archive->getFromName($fileName, 0, ZipArchive::FL_NOCASE);
        if ($contents === false) {
            $contents = $archive->getFromName(substr($fileName, 1), 0, ZipArchive::FL_NOCASE);
        }

        return $contents;
    }
private function getFromZipArchive(ZipArchive $archive, $fileName = '')
    {
        // Root-relative paths
        if (strpos($fileName, '//') !== false) {
            $fileName = substr($fileName, strpos($fileName, '//') + 1);
        }
        $fileName = File::realpath($fileName);

        // Sadly, some 3rd party xlsx generators don't use consistent case for filenaming
        //    so we need to load case-insensitively from the zip file

        // Apache POI fixes
        $contents = $archive->getFromName($fileName, 0, ZipArchive::FL_NOCASE);
        if ($contents === false) {
            $contents = $archive->getFromName(substr($fileName, 1), 0, ZipArchive::FL_NOCASE);
        }

        return $contents;
    }
@param ZipArchive $archive
@param string $fileName

@return string