title: How to retrieve digital signature information from PDF with PHP?
body: <p>I have app that needs to retrieve some data (signer name) from digital signature "attached" on PDF files.</p>
  
  <p>I have found only examples in Java and C# using the iText class AcroFields method GetSignatureNames</p>
  
  <p><strong>edit:</strong> I've tried <em>pdftk</em> with dump_data_fields and generate_fpdf and the result was that (unfortunately):</p>
  
  <pre><code>/Fields [
  &lt;&lt;
  /V /dftk.com.lowagie.text.pdf.PdfDictionary@3048918
  /T (Signature1)
  &gt;&gt;]
  </code></pre>
  
  <p>and</p>
  
  <pre><code>FieldType: Signature
  FieldName: Signature1
  FieldFlags: 0
  FieldJustification: Left
  </code></pre>
  
  <p>Thanks in Advance !</p>