Rasmus Lerdorf

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Rasmus Lerdorf
Rasmus Lerdorf August 2014 (cropped).JPG
Born (1968-11-22) 22 November 1968 (age 52)
Alma materUniversity of Waterloo
OccupationDistinguished[citation needed] Engineer at Etsy
Websitetoys.lerdorf.com Edit this at Wikidata
Rasmus Lerdorf talks about security with Joomla! developers at OSCMS 2007 Conference.

Rasmus Lerdorf (born 22 November 1968) is a Danish-Canadian[1] programmer. He co-authored and inspired the PHP scripting language, authoring the first two versions of the language and participating in the development of later versions led by a group of developers including Jim Winstead (who later created blo.gs), Stig Bakken, Shane Caraveo, Andi Gutmans, and Zeev Suraski. He continues to contribute to the project.

Early life and education[edit]

Lerdorf was born on Disko Island in Greenland and moved to Denmark in his early years.[2] Lerdorf's family moved to Canada from Denmark in 1980, and later moved to King City, Ontario in 1983.[3] He graduated from King City Secondary School in 1988, and in 1993 he graduated from the University of Waterloo with a Bachelor of Applied Science in Systems Design Engineering. He contributed to the Apache HTTP Server and he added the LIMIT clause to the mSQL DBMS. A variant of this LIMIT clause had already been around for a decade in mainframe relational database management systems (like Oracle Rdb running on VAX/VMS, formerly from Digital Equipment Corporation), but apparently it had not yet been picked up by the emerging PC-based databases. It was later adapted by several other SQL-compatible DBMS.[4][5] He released the first version of PHP in 1995.[6]


From September 2002 to November 2009 Lerdorf was employed by Yahoo! Inc. as an Infrastructure Architecture Engineer. In 2010, he joined WePay in order to develop their application programming interface.[7] Throughout 2011 he was a roving consultant for startups. On 22 February 2012 he announced on Twitter that he had joined Etsy.[8] In July 2013 Rasmus joined Jelastic as a senior advisor to help them with the creation of new technology.[9]

Lerdorf is a frequent speaker at Open Source conferences around the world. During his keynote presentation at OSCMS 2007, he presented a security vulnerability in each of the projects represented at the conference that year.[10]

Lerdorf also appeared at the WeAreDevelopers Conferences 2017 and 2019,[11] making a speech on the history of PHP, the new PHP 7 release in 2017, and the 25 years of PHP.[12]


In 2003, Lerdorf was named in the MIT Technology Review TR100 as one of the top 100 innovators in the world under the age of 35.[13]

See also[edit]


  1. ^ @rasmus (26 November 2016). "I am a Danish citizen again after losing it becoming Canadian and DK now allowing dual
    Tak @dalgaard_dw for alt du gør for udenlandsdanskere"
    (Tweet) – via Twitter.
  2. ^ «25 Years of PHP (by the Creator of PHP)» on YouTube
  3. ^ "Rasmus Lerdorf" (PDF). K.C.S.S. Alumni Association. Retrieved 21 February 2013.
  4. ^ "mod_info". Apache Reference. Archived from the original on 22 February 2001. Retrieved 6 May 2012.
  5. ^ Wendel, Ulf. "MaxDB & PHP - Ready for the Web!". Archived from the original on 6 June 2011. Retrieved 6 May 2012.
  6. ^ https://groups.google.com/forum/#!msg/comp.infosystems.www.authoring.cgi/PyJ25gZ6z7A/M9FkTUVDfcwJ
  7. ^ Kincaid, Jason (27 April 2010). "PHP Founder Rasmus Lerdorf Joins Group Payments Startup WePay". TechCrunch. Retrieved 6 May 2012.
  8. ^ Lerdorf, Rasmus (22 February 2012). "Excited to be joining..." Twitter. Retrieved 6 May 2012.
  9. ^ "The Creator Of PHP Shows Jelastic Support, As Advisor". Cloud Tweaks. Retrieved 2 July 2013.
  10. ^ "Rasmus Lerdorf Presentation at the OSCMS Summit 2007".
  11. ^ "WeAreDevelopers Conference 2019 program".
  12. ^ https://www.youtube.com/watch?v=fYTKm2oUzAg
  13. ^ "2003 Young Innovators Under 35". Technology Review. 2003. Retrieved 15 August 2011.

External links[edit]