There are several PHP scripts and classes to process PayPal payments using their native IPN (Internet payment notification) feature. Because the whole process is based on the data you need to send via a web form to the PayPal payment processor these script look very similar.

The payment / notification process is shown via the following graphic:

Inside the form there are several required values to process a payment. PayPal gives the advice to post them all to get everything working. The following variables get some special attention: (more…)

How to avoid the duplicate content penalty when using a Wordpress blog

There’s no denying it, Google is the powerhouse of the internet; more than capable of showering targeted visitors on your website like a torrential downpour backed by gale-force winds. That is, if you happen to be in Google’s good graces and rank highly for popular keywords.

Bloggers often times find themselves in the position to receive great traffic from Google simply because of the way that blogs work; namely, they allow for quick inclusion into major search engines even when using the default setup. Being the most popular blogging software on the planet, Wordpress blogs are the content management system (CMS) of choice for bloggers due to ease of use and the large community of supporters that help to develop plugins for this open source blogging software.

However, just because Wordpress blogs can help websites to get noticed by the major search engines easily, this doesn’t mean that they are inherently search engine friendly; in fact, the default settings for Wordpress blogs almost guarantee that, if left untouched, your blog will end up suffering from the duplicate content penalty.

The duplicate content penalty and Wordpress blogs

The duplicate content penalty is a term that is used to describe what happens when a web page is removed from the primary search results for a certain keyword phrase due to identical content elsewhere on the internet. In Google, the lower-ranking websites and individual pages that contain the duplicate content are hidden, and this phrase is displayed instead: (more…)