PHP Archives
Recently, I am working on an application where I have to convert addresses to their corresponding Lat and Lon. So, I decided to write on how to get Latitude and Longitude in Google Maps using only PHP.
To use the technique explained below, you need to have a Google Maps Key.
Where I work, my company uses Akamai as the CDN for all properties. Initially our company used non-RTMP downloadable URL from Akamai, but, later after some struggling (in May 2008 or so) I was able to figure out how to extract RTMP from Akamai's XML File.
Recently, a friend of mine asked me if there's an IMDB Parser that allows to fetch information about any Movie on IMDB. Unfortunately, IMDB does not offer an API, so , after doing a bit googling I found nice IMDB Grabber (PHP IMDB Grabber), despite it being a good one, I decided develop my own class relying on XPath and Dom Traversing.
XPath allows traversing through XML elements and attributes very easily. For complex XMLs, using XPath can significantly reduce the complexity of coding.
Good Tutorial of XPath can be viewed on W3C schools here. Reference on DomXPath can be viewed here.
XPath is useful if someone needs to extract a specific node from an entire XML, rather than parsing the entire XML by running a query. Below I will explain how to use DomDocument and DomXPath to read XML. At first I will start with a simple XML, and then more complex.
I came across an interesting scenario today. Like most developers, I like to add error_reporting(E_ALL) at the top of my PHP script. So, normally, I have my code like the following:
error_reporting(E_ALL);
immediately followed by html doctype
This is a continuation of previous article, where I wrote on how to use PHP'5 DOM to read XML Files easily. But, for large files, its better to use XMLReader. Unlike DomDocument, XMLReader does not load the entire File on memory. It reads an XML file one node at a time. I hardly use XMLReader because it requires writing a lot of codes, but for extremely large XML Files, its better to use it. Full reference on XMLReader can be viewed here. It requires PHP 5.2.
PHP-5's DOM and XMLReader provides the ability to read XML files easily. The good thing about PHP-5's DOM (mainly DomDocument, DomNodeList, DomNode) is that it implements the standard DOM features as specified by W3C. W3C's reference on DOM can be viewed here. So, if someone has used DOM before (say on JavaScript), then it would be easy for him/her to grasp PHP-5's DOM.
Since I wrote my ZCE Exam in last Sept 08', I have been using DomDocument mainly to generate XML files. Its a powerful library of PHP-5, one thing I find surprising is the lack of tutorials on the web on PHP-5's DomDocument. So, I decided to write a simple tutorial on how to use DomDocument to write XML. In this article, I will try to explain the basics of DomDocument and then will create a couple of simple XML files.
Over the last month I have been working on an e-commerce store for our company. One thing I did realize that most of the shipping modules out there are quite complex to use. So, I decided to create a simple Canada Post PHP Class.
Canada Post's specification requires parsing of XML files to retrieve values, hence I have used PHP-5's new features like DomDocument, DomXPath and stream functions which will only work with PHP-5 (you would need additional libraries to run it in PHP-4)
