Derick Rethans is a PHP internals expert, author of Xdebug and an OpenStreetMap and mapping enthusiast.

He has contributed in a number of ways to the PHP project, including the Xdebug debugging tool, and various extensions and additions. He's a frequent lecturer at conferences, the author of php|architect's Guide to Date and Time Programming, and the co-author of PHP 5 Power Programming. He is now working at MongoDB, where he works on the PHP, C, and C++ drivers for MongoDB, and date/time related server features.

In his spare time, he likes to travel, hike, ski and practise photography. You can reach him at



April 2012 -
PHP Engineer and Evangelist
I am the "voice" of PHP, on both the MongoDB team and within the broader MongoDB community. I am responsible for supporting MongoDB in the PHP ecosystem through driver development, integration with open source tools, community support, and developer advocacy.

Derick Rethans Limited / Self-employed Contractor

February 2010 - March 2012
I'm a self-employed contractor/consulting doing PHP and C projects.
Some of those projects include:

eZ Systems

July 2005 - January 2010
Working as project leader for the eZ Components project, eZ Systems AS in Norway.
June 2009 - October 2009
Serving on the board of directors for eZ Systems AS in Norway.
January 2004 - June 2005
Working as core-developer on eZ publish, eZ Systems AS in Norway.

The PHP Project

May 2002 - recent
Working on Xdebug, the PHP debugging and development assistent extension.
November 2001 - recent
Speaker at numerous conferences, seminars and usergroup meetings around the world.
August 1999 - recent
Joined the PHP development team and submitted my first patch: SWF support for getimagesize(). Since then I've been continiously contributing to the PHP project. I was release manager for PHP 4.1.1, various PHP 4.2.x releases and the PHP 4.4 series.
	certificationMay 2004 - Dec 2005
Helping out with the Zend Certification process in order to boost enterprise support for PHP.

JDI Media Solutions

January 2001 - December 2003
Working on countless projects for my own company, JDI Media Solutions.
October 1998
Founded JDI Media Solutions with two other class-mates to provide internet services to local customers.

Other work experience

June 1997 - October 1998
Did tech support for customers of PC Privé projects for Diabolo Informatisering.
October 2002 - January 2004
Editor-in-chief of the International PHP Magazine managing content and themes of issues.


May 2001
Received my Bachelors degree in CS and Information Technology.
1997 - 2001
Attended the Hogeschool van Arnhem en Nijmegen to study Computer Science.
1991 - 1997
Went to highschool at the Thomas à Kempis College.


(since September 2004)


April 2009
php|architect's Guide to Date and Time Programming, Derick Rethans, ISBN: 978-0-9810345-0-8
October 2004
PHP 5 Power Programming, Andi Gutmans, Stig Sæther Bakken, Derick Rethans, ISBN: 0-13-147149-X


June 2013
"Introduction to Document Databases with MongoDB", Web & PHP, June 2013
Januari - March 2009
3-part column in php|architect about PHP's Garbage Collection mechanism
Februari 2006
"eZ components", php|architect, Februari 2006, page 27 to 35
January 2005
"Transliteration with PHP", php|architect, January 2005
June 2005
"References: an in-depth look", php|architect, June 2005 [PDF]
December 2004
"Translittération en PHP", direction|php, December 2004, page 27 to 33
September 2004
"Debugging Questions and Xdebug Answers", php|architect, September 2004, page 9 to 22 [PDF]


December 13, 2015 — Royal Parks Winter 10km series - Regent's Park
10 km in 51m49s (5m11s/km)
September 15, 2015 — Run the River 2015
5 km in 24m56s (4m59s/km)
September 6, 2015 — Kew Gardens 10K
10 km in 49m17s (4m56s/km)
July 12, 2015 — British 10K London Run
10 km in 55m47s (5m34s/km)
June 4, 2015 — JP Morgan Corporate Challenge
3.2 miles (5.15 km) in 28m53s (5m37s/km)
April 12, 2015 — The Race Organiser - Hyde Park 10k
10 km in 59m13s (5m55s/km)

Contact Information


Web 2.0

facebook: derickr
flickr: derickrethans
twitter: @derickr
vimeo: derickr


My Amazon wishlist can be found here.