(PHP Extension) PDF List Unsigned Signature Fields

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Demonstrates how to list the unsigned signature fields in a PDF.

Note: This example requires Chilkat v9.5.0.90 or greater.

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<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$pdf = new CkPdf();

// Load a PDF containing 2 remaining unsigned signature fields:
$success = $pdf->LoadFile('qa_data/pdf/doctor_patient_parent.pdf');
if ($success == false) {
    print $pdf->lastErrorText() . "\n";
    exit;
}

// Note: This example requires Chilkat v9.5.0.90 or greater.
$json = new CkJsonObject();
$pdf->GetUnsignedSigFields($json);

$json->put_EmitCompact(false);
print $json->emit() . "\n";

// Result:
// {
//   "unsignedSigField": [
//     "doctor_signature",
//     "parent_signature"
//   ]
// }

// To iterate over the field names:

$i = 0;
$count_i = $json->SizeOfArray('unsignedSigField');
while ($i < $count_i) {
    $json->put_I($i);
    $strVal = $json->stringOf('unsignedSigField[i]');
    print $strVal . "\n";
    $i = $i + 1;
}


?>