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# CXII. PDF Functions

# Introduction

The PDF functions in PHP can create PDF files using the PDFlib library created by Thomas Merz.

The documentation in this section is only meant to be an overview of the available functions in the PDFlib library and should not be considered an exhaustive reference. For the full and detailed explanation of each function, consult the PDFlib Reference Manual which is included in all PDFlib packages distributed by PDFlib GmbH. It provides a very good overview of what PDFlib is capable of doing and contains the most up-to-date documentation of all functions.

All of the functions in PDFlib and the PHP module have identical function names and parameters. You will need to understand some of the basic concepts of PDF and PostScript to efficiently use this extension. All lengths and coordinates are measured in PostScript points. There are generally 72 PostScript points to an inch, but this depends on the output resolution. Please see the PDFlib Reference Manual included in the PDFlib distribution for a more thorough explanation of the coordinate system used.

With version 6, PDFlib offers an object oriented API for PHP 5 in addition to the function oriented API for PHP 4. The main difference is the following: In PHP 4, first a PDF resource has to be retrieved with a function call like $p = PDF_new();() which is used as the first parameter in all further function calls, e.g. as in PDF_begin_document($p, "", "")(). In PHP 5, a PDFlib object is created with $p = new PDFlib()() instead. This object offers all PDFlib API functions as methods, e.g. as with $p->begin_document("", "")(). In addition, exceptions have been introduced in PHP 5 which are supported by PDFlib 6 and later as well.

Please see the examples below for more information.

> Note: If you're interested in alternative free PDF generators that do not utilize external PDF libraries, see this related FAQ.

> Note: This extension has been moved to PECL as of PHP 4.3.9.

# Requirements

PDFlib is available for download at http://www.pdflib.com/products/pdflib/index.html, but requires that you purchase a license for commercial use.

# Issues with older versions of PDFlib

Any version of PHP 4 after March 9, 2000 does not support versions of PDFlib older than 3.0.

PDFlib 4.0 or greater is supported by PHP 4.3 and later.

# Installation

This PECL extension is not bundled with PHP. Additional information such as new releases, downloads, source files, maintainer information, and a CHANGELOG, can be located here: http://pecl.php.net/package/pdflib.

To get these functions to work in PHP < 4.3.9, you have to compile PHP with --with-pdflib[=DIR]. DIR is the PDFlib base install directory, defaults to `/usr/local`.

As of PHP 4.3.9, you must install this extension through PEAR, using the following command: pear install pdflib.

# Resource Types

This extension has no resource types defined.

# Remarks about Deprecated PDFlib Functions

Starting with PHP 4.0.5, the PHP extension for PDFlib is officially supported by PDFlib GmbH. This means that all the functions described in the PDFlib Reference Manual (PDFlib V3.0 or higher) are supported by PHP 4 with exactly the same meaning and the same parameters. However, with PDFlib V5.0.4 or higher all parameters have to be specified. For compatibility reasons, this binding for PDFlib still supports most of the deprecated functions, but they should be replaced by their new versions. PDFlib GmbH will not support any problems arising from the use of these deprecated functions. The documentation in this section indicates old functions as "Deprecated" and gives the replacement function to be used instead.

# Examples

Most of the functions are fairly easy to use. The most difficult part is probably creating your first PDF document. The following example should help to get you started. It is developed for PHP 4 and creates the file `hello.pdf` with one page. It defines some document info field contents, loads the Helvetica-Bold font and outputs the text "Hello world! (says PHP)".

Example 1. Hello World example from PDFlib distribution for PHP 4
`<?php $p = PDF_new(); /* open new PDF file; insert a file name to create the PDF on disk */ if (PDF_begin_document($p, "", "") == 0) { die("Error: " . PDF_get_errmsg($p)); } PDF_set_info($p, "Creator", "hello.php"); PDF_set_info($p, "Author", "Rainer Schaaf"); PDF_set_info($p, "Title", "Hello world (PHP)!"); PDF_begin_page_ext($p, 595, 842, ""); $font = PDF_load_font($p, "Helvetica-Bold", "winansi", ""); PDF_setfont($p, $font, 24.0); PDF_set_text_pos($p, 50, 700); PDF_show($p, "Hello world!"); PDF_continue_text($p, "(says PHP)"); PDF_end_page_ext($p, ""); PDF_end_document($p, ""); $buf = PDF_get_buffer($p); $len = strlen($buf); header("Content-type: application/pdf"); header("Content-Length: $len"); header("Content-Disposition: inline; filename=hello.pdf"); print $buf; PDF_delete($p); ?>`

The following example comes with the PDFlib distribution for PHP 5. It uses the new exception handling and object encapsulation features available in PHP 5. It creates the file `hello.pdf` with one page. It defines some document info field contents, loads the Helvetica-Bold font and outputs the text "Hello world! (says PHP)".

Example 2. Hello World example from PDFlib distribution for PHP 5
`<?php try { $p = new PDFlib(); /* open new PDF file; insert a file name to create the PDF on disk */ if ($p->begin_document("", "") == 0) { die("Error: " . $p->get_errmsg()); } $p->set_info("Creator", "hello.php"); $p->set_info("Author", "Rainer Schaaf"); $p->set_info("Title", "Hello world (PHP)!"); $p->begin_page_ext(595, 842, ""); $font = $p->load_font("Helvetica-Bold", "winansi", ""); $p->setfont($font, 24.0); $p->set_text_pos(50, 700); $p->show("Hello world!"); $p->continue_text("(says PHP)"); $p->end_page_ext(""); $p->end_document(""); $buf = $p->get_buffer(); $len = strlen($buf); header("Content-type: application/pdf"); header("Content-Length: $len"); header("Content-Disposition: inline; filename=hello.pdf"); print $buf; } catch (PDFlibException $e) { die("PDFlib exception occurred in hello sample:\n" . "[" . $e->get_errnum() . "] " . $e->get_apiname() . ": " . $e->get_errmsg() . "\n"); } catch (Exception $e) { die($e); } $p = 0; ?>`

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