I do hope that the rest of the article is better researched than the "Why PHP?" section. In one paragraph you've made two contradictory statements, and only one of them can be correct.
Here are your contradictory statements:
1. PHP scripts may be included in HTML and don't need compilation and they run on most web browsers.
Obviously, only number 2 is correct. PHP is server side only, so PHP scripts don't "run on most web browsers" - they don't run on any web browser at all.
I'm not familiar with the ibm_db2 extension to PHP, so I can't really comment on the accuracy of the rest of the article. I will say that the text appears to be mostly a paraphrasing of the imb_db2 manual, with no additional information and some interesting things from the manual ignored. A link to a complete copy of the manual would be useful. The one given doesn't work properly. Many of hte pages don't have any content. This one is complete: http://www.php-editors.com/php_manual/ref.ibm-db2.html
A better introduction would have included a section on why to use DB2 as opposed to some other DB, and a general discussion of how to go about using the ibm_db2 extension.
A statement of the actual goal of the tutorial would be a good thing as well.
I do hope the following parts of this tutorial will be of higher quality.