displayDefaultOrientation
Default: false
If default page orientation is P(portrait), any L(landscape) pages in the document are displayed in Adobe Reader
rotated to appear in portrait. Reverse is true if default orientation is landscape.
Examples
<?php
// Require composer autoload
require_once __DIR__ . '/vendor/autoload.php';
$mpdf = new \Mpdf\Mpdf(['displayDefaultOrientation' => true]);