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Use PHP and XSL to create a DHTML link graph

Build an RSS parser that creates a keyword list with word frequencies

Jack D. Herrington (jherr@pobox.com), Senior Software Engineer, Leverage Software
Jack D. Herrington is a senior software engineer with more than 20 years of experience. He's the author of three books: Code Generation in Action, Podcasting Hacks, and PHP Hacks. He has also written more than 30 articles.

Summary:  In this tutorial, you learn to build a link graph with XML, PHP, and JavaScript code. Link graphs are paragraphs of keywords in which the font size of each word is determined by some data value -- in this case, the frequency of the term. The more often the term occurs, the larger the font size of the word. This tutorial shows how to build an RSS parser that in turn builds a keyword list along with the word frequencies. It also demonstrates how to use XSLT to create an HTML page that shows the link graph and relates its term to its original article.

Date:  04 Oct 2005
Level:  Intermediate
PDF:  A4 and Letter (367 KB | 30 pages)Get Adobe® Reader®

Activity:  3854 views
Comments:  

Before you start

This tutorial guides you through building your own link graph -- that is, a visualization of the key terms from a data source. In this case, the data source consists of RSS feeds from common U.S. news sources.

About this tutorial

This tutorial walks through using XML, PHP, and JavaScript code to build a link graph. Link graphs are paragraphs of keywords in which the size of each word depends on some data value -- in this case, the frequency of the term. The more often the term occurs, the larger the font size of the word.

This tutorial shows how to build an RSS parser that in turn builds a keyword list along with the word frequencies. It also demonstrates how to use XSLT to create an HTML page that shows the link graph and relates its term to its original article.

You can find all of the code samples used in this tutorial in the Download section. The PHP code works with version 4.x or later.

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Prerequisites

Basic knowledge of PHP, RSS, and XML is required. XSLT (through Saxon) is used in this tutorial but is explained as it appears.

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static.content.url=http://www.ibm.com/developerworks/js/artrating/
SITE_ID=1
Zone=XML, Web development
ArticleID=138331
TutorialTitle=Use PHP and XSL to create a DHTML link graph
publish-date=10042005
author1-email=jherr@pobox.com
author1-email-cc=dwxed@us.ibm.com

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