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Unit 12: Portable Document Format

• PDF files have the concept of the current text position. It’s like a cursor unless you specify Notes
another location, when you insert text it appears at the current text location. You set the
text location with the pdf_set_textpos( ) function.
• Using nonstandard fonts without embedding them makes your documents much less
portable, while embedding them makes your generated PDF files much larger.
• PDF supports many different embedded image formats: PNG, JPEG, GIF, TIFF, CCITT,
and a raw image format that consists of a stream of the exact byte sequence of pixels. Not
every feature of every format is supported.
• The scale parameter indicates the proportional scaling factor to be used when placing the
image in the document.
• PDF provides several navigation features for PDF files. Bookmarks function as a table of
contents for the document, and you can provide viewers with thumbnail images indicating
what’s at the other end of each bookmark. In addition, any part of a PDF page can be linked
to another part of the current PDF file, another PDF file, or a completely different file.

12.7 Keywords

Apache: The Apache library contains functions specific to running PHP under Apache.
Calendar: The calendar library provides a number of functions for converting between various
calendar formats, including the Julian Day Count, the Gregorian calendar, the Jewish calendar,
the French Republican Calendar, and Unix timestamp values.

CCVS: CCVS is a library for providing a conduit between your server and credit-card processing
centers via a modem.

Cybercash: Cybercash is a provider of credit-card processing services. The Cybercash functions
provide access to Cybercash transactions from PHP.

Document: A PHP document is made up of a number of pages. Each page contains text and/
or images.
EXIF: The Exchangeable Image File Format (EXIF) extension provides a function to read the
information stored on a device; many digital cameras store their information in EXIF format.
FDF: The Forms Data Format (FDF) is a library for creating forms in PDF documents and
extracting data from or populating those forms. The FDF extension allows you to interpret data
from an FDF-enabled PDF document or to add FDF form fields to a PDF document.
Pattern: A pattern is a reusable component, defined outside of a page context that is used in
place of a color for filling or stroking a path.
PDF: Stands for “Portable Document Format.” PDF is a multi-platform file format developed
by Adobe Systems.

1. Develop a PHP program to show the font demonstration.
2. Create a pattern from a small PHP logo image and uses it to fill a circle.

12.8 Review Questions

1. What is the mean of PDF? What are the PDF files and why these are used?

2. What are the PDF extensions? Why these are used?

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