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Server: Apache/2.4.46 (Ubuntu)
System: Linux localhost 5.11.0-49-generic #55-Ubuntu SMP Wed Jan 12 17:36:34 UTC 2022 x86_64
User: root (0)
PHP: 7.4.16
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File: /var/www/html/invoice-download/index.php
<?php

require __DIR__.'/vendor/autoload.php';

use mikehaertl\wkhtmlto\Pdf;

// You can pass a filename, a HTML string, an URL or an options array to the constructor
$pdf = new Pdf('http://45.79.125.34:7878/order-invoice-mobile/0Ug4b93uRVrKsVqkdY2qE4PQxIZOPpqRvFzYk');

// On some systems you may have to set the path to the wkhtmltopdf executable
// $pdf->binary = 'C:\...';

//if (!$pdf->saveAs('invoice.pdf')) {
  //  echo $error = $pdf->getError();
    // ... handle error here
//}


//$width=$pdf->GetPageWidth(); // Width of Current Page
//$height=$pdf->GetPageHeight(); // Height of Current Page

//$pdf->Line(0, 0,$width,$height); // Line one Cross
//$pdf->Line($width, 0,0,$height); // Line two Cross

$pdf->send('invoice.pdf', false, array(
    'Content-Length' => false,
));