Stefan Koopmanschap had a problem - the formatting on his dateTime fields (the XSD type) wasn't cooperating and couldn't be validated. He asked the question of the community of how to correct this and was given a short and easy answer from David Zuelke using date.

Recently I had to compose some XML documents that needed to be validated with XSDs. All fine of course, but I had some problem with two date/time fields that according to the XSD were supposed to be xs:dateTime fields. Googling around I found a lot of references to the ISO8601 format, so I decided to format my date using the DATE_ISO8601 constant. That did not work though.

David's suggestion was to use "date('c')" (the full ISO 8601 date) instead of the DATE_ISO8601 constant. The trouble is caused by a missing colon in the second choice's output.

Federico Cargnelutti has posted a class (DateIntervalFormat) that gives you the difference between a date and "now" in words rather than an integer.

This class, a refactored version of Drupal's format_interval function, makes it relatively easy to format an interval value. The format will automatically format as compactly as possible. For example: if the difference between the two dates is only a few hours and both dates occur on the same day, the year, month, and day parts of the date will be omitted.

So, instead of getting a value of "86400 seconds" you'd get back something like "5 days 3 hours".

On the SmartyCode.com site, there was a new article posted recently looking at making the output of your Zend Framework application XHTML compliant.

Serving XHTML is often misunderstood by php developers. Frontend engineers simply include the XHTML doctype to their documents, without actually serving document as XHTML. This triggers majority of the browsers to treat such pages as 'tag-soup'. [...] This front controller plugin's code mostly takes concepts from the excellent article by Keystone Websites, but implements in Zend Framework environment in an object-oriented way.

The code works as a plugin to the controller and runs a few checks on the contents of the data being pushed out (dispatchLoopShutdown) and returns the correct header information (DOCTYPE, language attribute) in the correct XHTML format for the data. When the plugin is registered, all it takes is a call to the "doctype()" method to output the correct information.

On the TotalPHP site there's a new tutorial showing how to pull data from your database and export it as a CSV file that tools like Excel can read in and use.

There are some occasions where you would want to export your site's information in CSV or similar text format. You might want to do this so you can view reports in a spreadsheet, or you might want an export of your product information to upload to a service like Google Products. Either way the method and end result are essentially the same.

The tutorial shows how to grab the information (via the mysqli functionality in PHP5) and formatting each row with the correct values in a certain order. Finally, the entire contents are echoed back out with the correct header() to force a download on the user's browser.

The Zend Developer Zone has posted this new tutorial from Vikram Vaswani covering the use of different archive formats (like RAR, LZF and BZ2 compression methods) from inside PHP.

When it comes to dealing with different file formats, it's hard to faze PHP. XML documents, PDF files, JPEG images, MP3 media...you name it and, chances are, there's a PHP extension to handle it. And so it is with compression formats like RAR, LZF and Bzip2 - although these archive formats are far less common today than the ubiquitous TAR and ZIP formats, they are still actively used by many applications and projects, and continue to be supported in PHP via PECL extensions.

He pulls in a few PECL extensions to give PHP the power it needs, both for unix-based systems and Windows DLL files. He includes some sample code showing how to open up a rar file and list the contents inside as well as extract the files themselves. And, of course, code examples for compressing files into a new archive is included too.

This new post on the Symfony blog today looks at using the framework's built-in support for the YAML format. They include a few examples of the code to make the files and how to use them.

Here is a short tutorial about my discovery of the new YAML parsing library that comes with symfony 1.1. As you may know, YAML files are a place symfony developers spend time writing configuration, it is very important they have a good tool to manipulate data and debug files.

They include code showing how to pull in a sample file, access the properties inside of it and how to take a multi-dimensional PHP array and push it back out (automagically) into a new YAML formatted file.

On the ThinkPHP blog today, Annika Rabea shares a method for outputting dates in words rather than in the usual numbers most applications use.

Recently, I have to output the age of a date in words and didn't have a framework to work with. The first steps were to parse the given date into an array and create a timestamp with the individual parts. The difference between the timestamp of now and the created timestamp yielded the age in seconds. The result can be used to compare with seconds of a day, week, etc.

The code snippet in the post outputs the difference between two timestamps (then and now) it a bit more friendly way (ex. 4 months, 2 weeks, 2 days).

Derick Rethans has posted about a new function he's whipped up for PHP's date/time functionality to handle the differences between US formatted dates and the British date formats - date_create_from_format.

From PHP 5.3 the new date_create_from_format() function and the DateTime::createFromFormat() factory method are available. As first argument they accept the expected format, and as second argument the string to parse.

He includes two examples - one showing it being used to parse a British date string and the other to show off the date_get_last_errors function that can be useful for debugging.

Richard Lord has a quick post about a handy library that can help with the creation of AVM2 swf files from inside of PHP.

It creates the number formats used in AVM2 swfs, as described here. I created these functions for the SWX project and am releasing the code under the MIT license so it can be used in other projects too.

You can download the file directly from his blog. You can find out more about the native data format (SWX) for Flash on the SWX Format website.

Kore Nordmann has posted a new article series (to the "Articles" section of his site) with six different pieces talking about different aspects of image creation with PHP:

• Image creation with PHP - Image Tools
• Image creation with PHP - Text rendering
• Image creation with PHP - Integrating bitmaps
• Image creation with PHP - Gradient rendering
• Image creation with PHP - A first shape
• Image creation with PHP - Formats & Libraries

Each of them can be read separately, but they're all part of a series and make more sense when read together.