title: Merge PDFs using php code
body: <p>I want to merge PDFs using php code.
  So i have used this code from some site but this code isn't working for me it is giving me error as Class 'PDFMerger' not found..
  Output folder is still empty even after execution of this code.
  I am running code on localhost using xampp.                                                                                                 </p>
  
  <pre><code>&lt;?php
      include 'PDFMerger.php';
  
      $pdf = new PDFMerger;
  
      $pdf-&gt;addPDF('D:/sample/pdf-1.pdf', 'all')
          -&gt;addPDF('D:/sample/pdf-2.pdf', 'all')
          -&gt;addPDF('D:/sample/pdf-3.pdf', 'all')
          -&gt;merge('file', 'D:/output/merged.pdf');
  ?&gt;
  </code></pre>