LinuxTag is the most important place for Linux and open source software in Europe. Last year, LinuxTag had over ten thousand attendees, and over 300 speakers. This year, the 16th LinuxTag will be June 9-12, 2010 at the Berlin Fairgrounds in Germany.

LinuxTag seeks exciting and suitable proposals for presentations in the conference tracks. The Call for Papers ends today.

I am proud to be a member of the LinuxTag Program Committee. Although a lot of proposals have already been submitted, there are some topics missing that I’d personally like to see covered. So, if you’re up for a last minute submission, get your inspiration from the following list:

• Is/was the recent economic crisis an …

In previous articles, we examined the maximum performance of basic web static and dynamic (php) requests. In this article, we will take a look at what happens when a database access is added to a simple php page. The application code is part of the corelamp workload (see webapp/hellomysql.php).

In this application, I added a single database row request to the TABLES table in the …

Installing Lighttpd With PHP5 And MySQL Support On CentOS 5.4

Lighttpd is a secure, fast, standards-compliant web server designed for speed-critical environments. This tutorial shows how you can install Lighttpd on a CentOS 5.4 server with PHP5 support (through FastCGI) and MySQL support.

I’ve been using a lot of RESTful services these days and have been waiting for a good book that is dedicated to the topic. I recently received a copy of ‘RESTful PHP Web Services’, which does a successful job of outlining proven concepts in current web technology. If you want to learn the methods for creating and consuming RESTful services then you will find many examples in this book. From the architectural plans to well thought out code samples, the book covers a lot of ground in a relatively quick read.

The first chapter gives the reader a quick introduction to RESTful services and the most common PHP frameworks in use at the time of writing. I particularly enjoyed the section on the Zend framework due to the explanation of benefits over the other frameworks. …

At dealnews we have three tiers of servers. First is our development servers, then staging and finally production. The complexity of the environment increases at each level. On a development server, everything runs on the localhost: mysql, memcached, etc. At the staging level, there is a dedicated MySQL server. In production, it gets quite wild with redundant services and two data centers.

One of the challenges of this is where and how to store the connection information for all these services. We have done several things in the past. The most common thing is to store this information in a PHP file. It may be per server or there could be one big file like:

<?php

if(DEV){
    $server = "localhost";
} else {
    $server = "10.1.1.25";
}

?>

This gets messy quickly. Option two is to …

First of all, I'd like to thank everyone who read and gave their 2 cents about the [WordPress Plugin Development] How To Include CSS and JavaScript Conditionally And Only When Needed By The Posts post. The article was well received and will hopefully spark some optimizations around loading styles and scripts.

Here are some discussions and mentions around the web:

• an article on Weblog Tools Collection
• a forum post on WP Tavern
• …

Your site is getting awfully slow? There's just to much reads to your database and you have already tweaked the performance of every query? In most cases data caching is the solution to your problem!

The idea is to cache all processed data you heave retrieved from the database. Let us look on a example. It uses a mockup class that basically can handle any caching system like memcached or xcache

Installing Apache2 With PHP5 And MySQL Support On Fedora 12 (LAMP)

LAMP is short for Linux, Apache, MySQL, PHP. This tutorial shows how you can install an Apache2 webserver on a Fedora 12 server with PHP5 support (mod_php) and MySQL support.

I ran into an interesting issue when installing Wordpress on my re-installed server, I could not get a database connection during installation. I added some debugging and discovered that I had a "Can't connect to MySQL server on" error returned after the call to mysql_connect() in PHP.

To check the source of the issue I then tried to connect on the command-line using the mysql client, which occurred successfully, confirming that I was using the correct credentials and host address (this was a remote MySQL server).

I next created a test PHP script with a simple mysql_connect() call, and executed it with "php test.php" from the command-line, which was also successful.

Finally I accessed test.php through a browser, where again the connection failed.

So I was dealing with a situation where it was Apache in particular that was unable to connect to the remote MySQL server. Thanks to …

I’ve released version 1.1.6 of the Better Cacti Templates project. This release includes a bunch of bug fixes (but not all of them!) and two new sets of graphs. One set is for disk I/O on GNU/Linux, and the other is a new set of templates for OpenVZ. I’m looking for feedback on both of those. This release also has a bunch of code-level features: much better test coverage (hooray!), and a refactored ss_get_by_ssh.php that makes it much easier to create new graphs and templates. The SSH-based templates also take advantage of the same caching as the MySQL templates, which makes them a lot more efficient.

There are upgrade instructions on the project wiki for this and all releases. There is also a comprehensive tutorial on …