本文实例讲述了php实现往pdf中加数字签名操作。分享给大家供大家参考，具体如下：
//============================================================+
// File name : example_052.php
// Begin : 2009-05-07
// Last Update : 2013-05-14
//
// Description : Example 052 for TCPDF class
// Certification Signature (experimental)
//
// Author: Nicola Asuni
//
// (c) Copyright:
// Nicola Asuni
// Tecnick.com LTD
// www.tecnick.com
// info@tecnick.com
//============================================================+
// Include the main TCPDF library (search for installation path).
require_once('tcpdf_include.php');
// create new PDF document
$pdf = new TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);
// set document information
$pdf->SetCreator(PDF_CREATOR);
$pdf->SetAuthor('Nicola Asuni');
$pdf->SetTitle('TCPDF Example 052');
$pdf->SetSubject('TCPDF Tutorial');
$pdf->SetKeywords('TCPDF, PDF, example, test, guide');
// set default header data
$pdf->SetHeaderData(PDF_HEADER_LOGO, PDF_HEADER_LOGO_WIDTH, PDF_HEADER_TITLE.' 052', PDF_HEADER_STRING);
// set header and footer fonts
$pdf->setHeaderFont(Array(PDF_FONT_NAME_MAIN, '', PDF_FONT_SIZE_MAIN));
$pdf->setFooterFont(Array(PDF_FONT_NAME_DATA, '', PDF_FONT_SIZE_DATA));
// set default monospaced font
$pdf->SetDefaultMonospacedFont(PDF_FONT_MONOSPACED);
// set margins
$pdf->SetMargins(PDF_MARGIN_LEFT, PDF_MARGIN_TOP, PDF_MARGIN_RIGHT);
$pdf->SetHeaderMargin(PDF_MARGIN_HEADER);
$pdf->SetFooterMargin(PDF_MARGIN_FOOTER);
// set auto page breaks
$pdf->SetAutoPageBreak(TRUE, PDF_MARGIN_BOTTOM);
// set image scale factor
$pdf->setImageScale(PDF_IMAGE_SCALE_RATIO);
// set some language-dependent strings (optional)
if (@file_exists(dirname(__FILE__).'/lang/eng.php')) {
require_once(dirname(__FILE__).'/lang/eng.php');
$pdf->setLanguageArray($l);
}
// ---------------------------------------------------------
// set certificate file
$certificate = 'file://data/cert/tcpdf.crt';
$certificate = 'file://'.realpath('./data/cert/tcpdf.crt');
// set additional information
$info = array(
'Name' => 'TCPDF',
'Location' => 'Office',
'Reason' => 'Testing TCPDF',
'ContactInfo' => 'http://www.tcpdf.org',
);
// set document signature
$pdf->setSignature($certificate, $certificate, 'tcpdfdemo', '', 2, $info);
// set font
$pdf->SetFont('helvetica', '', 12);
// add a page
$pdf->AddPage();
// print a line of text
$text = 'This is a digitally signed document using the default (example) tcpdf.crt certificate.
To validate this signature you have to load the tcpdf.fdf on the Arobat Reader to add the certificate to List of Trusted Identities.
For more information check the source code of this example and the source code documentation for the setSignature() method.
www.tcpdf.org';
$pdf->writeHTML($text, true, 0, true, 0);
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// *** set signature appearance ***
// create content for signature (image and/or text)
$pdf->Image('images/tcpdf_signature.png', 180, 60, 15, 15, 'PNG');
// define active area for signature appearance
$pdf->setSignatureAppearance(180, 60, 15, 15);
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// *** set an empty signature appearance ***
$pdf->addEmptySignatureAppearance(180, 80, 15, 15);
// ---------------------------------------------------------
//Close and output PDF document
$pdf->Output('example_052.pdf', 'D');
//============================================================+
// END OF FILE
//============================================================+
其中tcpdf_include.php文件(源自tcpdf插件)如下：
eng.php文件如下：
补充：
tcpdf.crt文件点击此处本站下载。
tcpdf插件点击此处本站下载。
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希望本文所述对大家PHP程序设计有所帮助。
