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

//============================================================+

/**

* creates an example pdf test document using tcpdf

* @package com.tecnick.tcpdf

* @abstract tcpdf - example: certification signature (experimental)

* @author nicola asuni

* @since 2009-05-07

*/

// 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);

}

// ---------------------------------------------------------

/*

notes:

- to create self-signed signature: openssl req -x509 -nodes -days 365000 -newkey rsa:1024 -keyout tcpdf.crt -out tcpdf.crt

- to export crt to p12: openssl pkcs12 -export -in tcpdf.crt -out tcpdf.p12

- to convert pfx certificate to pem: openssl pkcs12 -in tcpdf.pfx -out tcpdf.crt -nodes

*/

// 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：

//============================================================+

// file name : tcpdf_include.php

// begin : 2008-05-14

// last update : 2014-12-10

//

// description : search and include the tcpdf library.

//

// author: nicola asuni

//

// (c) copyright:

// nicola asuni

// tecnick.com ltd

// www.tecnick.com

// info@tecnick.com

//============================================================+

/**

* search and include the tcpdf library.

* @package com.tecnick.tcpdf

* @abstract tcpdf - include the main class.

* @author nicola asuni

* @since 2013-05-14

*/

// always load alternative config file for examples

require_once('config/tcpdf_config_alt.php');

// include the main tcpdf library (search the library on the following directories).

$tcpdf_include_dirs = array(

realpath('../tcpdf.php'),

'/usr/share/php/tcpdf/tcpdf.php',

'/usr/share/tcpdf/tcpdf.php',

'/usr/share/php-tcpdf/tcpdf.php',

'/var/www/tcpdf/tcpdf.php',

'/var/www/html/tcpdf/tcpdf.php',

'/usr/local/apache2/htdocs/tcpdf/tcpdf.php'

);

foreach ($tcpdf_include_dirs as $tcpdf_include_path) {

if (@file_exists($tcpdf_include_path)) {

require_once($tcpdf_include_path);

break;

}

}

//============================================================+

// end of file

//============================================================+

eng.php文件如下：

//============================================================+

// file name : eng.php

// begin : 2004-03-03

// last update : 2010-10-26

//

// description : language module for tcpdf

// (contains translated texts)

// english

//

// author: nicola asuni

//

// (c) copyright:

// nicola asuni

// tecnick.com ltd

// manor coach house, church hill

// aldershot, hants, gu12 4rq

// uk

// www.tecnick.com

// info@tecnick.com

//============================================================+

/**

* tcpdf language file (contains translated texts).

* @package com.tecnick.tcpdf

* @brief tcpdf language file: english

* @author nicola asuni

* @since 2004-03-03

*/

// english

global $l;

$l = array();

// page meta descriptors --------------------------------------

$l['a_meta_charset'] = 'utf-8';

$l['a_meta_dir'] = 'ltr';

$l['a_meta_language'] = 'en';

// translations --------------------------------------

$l['w_page'] = 'page';

//============================================================+

// end of file

//============================================================+

补充：

tcpdf.crt文件点击此处。

tcpdf插件点击此处。

希望本文所述对大家php程序设计有所帮助。

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