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Parsing Child Nodes with the DOM XML extension in PHP 5
In this last chapter of the series, I’m going to teach you how to handle the child nodes of an XML document by way of two simple methods, called hasChildNode() and removeChild() respectively. So let’s not waste any more time in preliminaries and learn how to use them in a helpful way.
During your life as a PHP developer, it’s quite possible that you've already built web applications that work with XML documents that needed to be parsed in one form or another. Of course, based on your own experience, you know that this process can be challenging, since handling XML data requires frequently traversing document nodes, dealing with attributes, copying elements from one place to another, and so forth.
Fortunately, PHP comes packaged with a powerful extension, called DOM XML, that can be used to work on XML documents by using the API provided by the Document Object Model (commonly known as DOM). Thus, if you wish to learn the most important methods provided by this XML library, then this series of articles may be what you’re looking for.
Welcome to the final part of the series “A quick overview of the DOM XML extension in PHP 5.” It is made up of seven approachable tutorials that go through some of the most relevant features that come bundled with this helpful PHP extension and is aimed at parsing XML documents in a painless way.
Having already established the objective of this series of articles, now I’m going to briefly rehash the items that were treated in the preceding tutorial, so you can link them more easily with what I plan to discuss in this last installment. In the aforementioned article, I demonstrated how to retrieve the attributes corresponding to a certain number of nodes within an XML document via the “getAttribute()” method.
In addition to teaching you how to work with the previous method, I showed you another one, called “hasAttribute()”, which came in handy for determining whether a particular element of an XML document contained an attribute or not. And lastly, I finished the tutorial by teaching you how to clone different nodes using the “cloneNode()” method, which is a process that hopefully was quite easy to understand.
So far, so good. At this stage, you’re armed with the right pointers to start using some of the most useful methods that come included with the DOM XML extension. However, the question that comes up now is: are there any additional features that still remain uncovered? Actually, this library has many other methods that can be useful for parsing XML documents, but in this last part of the series, I’ll be covering only a couple more. If you want to have a full reference guide on the DOM XML extension, the best place to go is the official PHP website.