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You can use the PDF functions in PHP to create PDF files if you
have the PDF library by Thomas Merz (available at
http://www.pdflib.com/pdflib/index.html;
you will also need the JPEG library
and the TIFF library to
compile this. These two libs also quite often make problems when
configuring php. Follow the messages of configure to fix possible
problems. If you use pdflib 2.01 check how the lib was installed.
There should be file or link libpdf.so. Version 2.01 just creates
a lib with the name libpdf2.01.so which cannot be found when linking
the test programm in configure. You will have to create a symbolic
link from libpdf.so to libpdf2.01.so.).
Version 2.20 of pdflib has introduced more changes to its API and
support for chinese and japanese fonts. This unfortunately causes
some changes of the pdf module of php4 (not php3). If you use pdflib 2.20
handle the in memory generation of PDF documents with care. Until
pdflib 3.0 is released it might be unstable. The encoding parameter
of pdf_set_font() has changed to a string. This
means that instead of e.g. 4 you have to use 'winansi'.
If you use pdflib 2.30 the pdf_set_text_matrix()
will have gone. It is not supported any more. In general it is a good
advise to consult the release notes of the used version of pdflib
for possible changes.
Since version 3.0 of pdflib you should configure pdflib with the option
--enable-shared-pdflib.
Any version of PHP4 after March, 9th 2000 do not support versions
of pdflib older than 3.0. PHP3 on the other hand should not be used
with version newer than 2.01.
Please consult the excellent documentation for
pdflib shipped with the source distribution of pdflib.
It provides a very good overview of what pdflib capable of doing.
Most of the functions in pdflib
and the PHP module have the same name. The parameters are also
identical. You should also understand some of the concepts of PDF
or Postscript to efficiently use this module.
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.
There is another PHP module for pdf document creation based on
FastIO's.
ClibPDF. It has a slightly different API. Check the
ClibPDF functions section for
details.
Currently all versions of pdflib are supported. It
is recommended that you use the newest version since it has more
features and fixes some problems which required a patch for the old
version. Unfortunately, the changes of the pdflib API in 2.x
compared to 0.6 have
been so severe that even some PHP functions had to be altered. Here
is a list of changes:
The Info structure does not exist anymore. Therefore the function
pdf_get_info() is obsolete and the functions
pdf_set_info_creator(),
pdf_set_info_title(),
pdf_set_info_author(),
pdf_set_info_subject() and
pdf_set_info_keywords() do not take the
info structure as the first parameter but the pdf document. This
also means that the pdf document must be opened before these functions
can be called. The above functions can and should also be replaced by
pdf_set_info()
The way a new document is opened has changed. The function
pdf_open() takes only one parameter which is
the file handle of a file opened with fopen().
There were some more changes with the release 2.01 of pdflib which
should be covered by PHP. Some functions are not required anymore
(e.g. pdf_put_image()). You will get a warning so
don't be shocked.
The pdf module introduces two new types of variables (if pdflib 2.x
is used it is only one new type). They are called
pdfdoc and pdfinfo
(pdfinfo is not existent if pdflib 2.x is used.
pdfdoc is a pointer to a pdf document and
almost all functions need it as its first parameter.
pdfinfo contains meta data about the PDF
document. It has to be set before pdf_open() is
called.
Note: The following is only true for pdflib 0.6. Read the pdflib
manual for newer version
In order to output text into a PDF document you will need to provide
the afm file for each font. Afm files contain font metrics for a
Postscript font. By default these afm files are searched
for in a directory named 'fonts' relative to the directory where the
PHP script is located. (Again, this was true for pdflib 0.6, newer
versions do not not neccessarily need the afm files.)
Most of the functions are fairly easy to use. The most difficult part
is probably to create a very simple pdf document at all. The following
example should help to get started. It uses the PHP functions for
pdflib 0.6. It creates the file test.pdf
with one page. The page contains the text "Times-Roman" in an
outlined 30pt font. The text is also underlined.
Example 1. Creating a PDF document with pdflib 0.6
The pdflib distribution contains a more complex example which
creates a serious of pages with an analog clock. This example
converted into PHP using pdflib 2.x looks as the following (you
can see the same example in the documentation for the
clibpdf module):
Example 3. pdfclock example from pdflib 2.x distribution