A number of small top-down case studies concerned with WordPress upgrades, bringing plugins up to date with the latest WordPress features and transforming legacy custom tables into latest custom posts

1. Welcome
Legacy to Latest
Kieran O'Shea
kieran@kieranoshea.com • @kieranoshea • http://www.kieranoshea.com/
"A number of small top-down case studies
concerned with WordPress upgrades, bringing
plugins up to date with the latest WordPress
features and transforming legacy custom tables
into latest custom posts"
Legacy to Latest Kieran O'Shea

2. About me
 Day job in the finance industry
 Open Source Work
 RouterTech
 Firmware for AR7 based routers
 WordPress Plugins
 Calendar
Legacy to Latest Kieran O'Shea

3. Introduction
 Why is considering legacy important?
 Basic overview of considerations
 Server
 Themes
 Plugins
 Freebies
 Questions
Legacy to Latest Kieran O'Shea

4. Blast from the past!
 Anyone remember this!?
Legacy to Latest Kieran O'Shea

5. One Step Solution
 WordPress upgrades are simple...
 Or are they?
Legacy to Latest Kieran O'Shea

6. Legacy is everywhere
 Enterprise takes the long view
Legacy to Latest Kieran O'Shea

7. Dependency hell?
 Upgrade errors from legacy are likely
[kieran@server:~]$ sudo do-release-upgrade
...
A unresolvable problem occurred while calculating the upgrade.
This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unofficial software packages not provided by Ubuntu
 Proceed manually but be careful!
Legacy to Latest Kieran O'Shea

8. Themes
 Should work without much coaxing
 Beware of
 Modified default themes
 Deprecated functions
 Phantom features
Legacy to Latest Kieran O'Shea

9. Plugins
 Can break an upgrade
 Can be broken by an upgrade
 Deprecated functions
 Logging on & bug hunt
 WordPress Logging
Legacy to Latest Kieran O'Shea

10. Custom Posts
 Legacy plugins may over-use tables
 Post framework makes code simpler
 Expose plugin data
 Migration simplified
Legacy to Latest Kieran O'Shea

11. Freebies
 Deserve one after a tricky upgrade?
Legacy to Latest Kieran O'Shea

12. Questions?
Test site, code & other goodies:
https://wcuk.kieranoshea.com/
Kieran O'Shea • kieran@kieranoshea.com
@kieranoshea • http://www.kieranoshea.com/
Legacy to Latest Kieran O'Shea