wkhtmltopdf在通过PHP执行时挂起10％但通过命令行成功运行

I use phpwkhtmltopdf as described here How do I get WKHTMLTOPDF to execute via PHP?

to convert html to pdf

set_time_limit (0);

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

use mikehaertl\wkhtmlto\Pdf; 

$pdf = new Pdf; 

$pdf->addPage('<html><h1>PDF creation successfull</h1></html>');

$pdf->send('test.pdf');
  if (!$pdf->send('test.pdf')) {
          throw new Exception('Could not create PDF: '.$pdf->getError());
      }

when i run this i get the following error

Fatal error: Uncaught exception 'Exception' with message 'Could not create PDF: Loading pages (1/6) [> ] 0% [======> ] 10% ' in /home/kpninfotech/public_html/pdfbin/convert.php:30 Stack trace: #0 {main} thrown in /home/kpninfotech/public_html/pdfbin/convert.php on line 30

I also tried to run exec command from php

   error_reporting(E_ALL);
    ini_set('display_errors', '1');
    $cmd = "/usr/bin/wkhtmltopdf http://www.kpninfotech.com test.pdf 2>&1";
    echo $t = exec($cmd);
    exit();

Here also i get the same error

[> ] 0% [======> ] 10%

But the pdf conversion runs successfully when executed via ssh enter image description here

But i couldn't execute via PHP, How can i execute it via PHP?

I have VPS server running centos 6.5, wkhtmltopdf version 0.12.1 (with patched qt)

I solved this exaticly problem setting options disable-javascript.

Try this.

use mikehaertl\wkhtmlto\Pdf; 

$pdf = new Pdf(array('disable-javascript')); 

$pdf->addPage('<html><h1>PDF creation successfull</h1></html>');

$pdf->send('test.pdf');
if (!$pdf->send('test.pdf')) {
  throw new Exception('Could not create PDF: '.$pdf->getError());
}