PHPePub\Core\EPub::sendBook PHP Method

    function sendBook($fileName)
    {
        if (!$this->isFinalized) {
            $this->finalize();
        }
        if (!BinStringStatic::endsWith($fileName, ".epub")) {
            $fileName .= ".epub";
        }
        if (true === $this->zip->sendZip($fileName, "application/epub+zip")) {
            return $fileName;
        }
        return false;
    }

$book->rootLevel();
// $log->logLine("Add TOC");
// $book->buildTOC();
$book->addChapter("Log", "Log.html", $content_start . $log->getLog() . "\n</pre>" . $bookEnd);
if ($book->isLogging) {
    // Only used in case we need to debug EPub.php.
    $epuplog = $book->getLog();
    $book->addChapter("ePubLog", "ePubLog.html", $content_start . $epuplog . "\n</pre>" . $bookEnd);
}
$book->finalize();
// Finalize the book, and build the archive.
// This is not really a part of the EPub class, but IF you have errors and want to know about them,
//  they would have been written to the output buffer, preventing the book from being sent.
//  This behaviour is desired as the book will then most likely be corrupt.
//  However you might want to dump the output to a log, this example section can do that:
/*
if (ob_get_contents() !== false && ob_get_contents() != '') {
    $f = fopen ('./log.txt', 'a') or die("Unable to open log.txt.");
    fwrite($f, "\r\n" . date("D, d M Y H:i:s T") . ": Error in " . __FILE__ . ": \r\n");
    fwrite($f, ob_get_contents() . "\r\n");
    fclose($f);
}
*/
// Save book as a file relative to your script (for local ePub generation)
// Notice that the extension .epub will be added by the script.
// The second parameter is a directory name which is '.' by default. Don't use trailing slash!
//$book->saveBook('epub-filename', '.');
// Send the book to the client. ".epub" will be appended if missing.
$zipData = $book->sendBook("ExampleBook1");
// After this point your script should call exit. If anything is written to the output,
// it'll be appended to the end of the book, causing the epub file to become corrupt.