This presentation shows how one can build a wordpress plugin from scratch. In particular it demonstrates a simple plugin for embedding pinobo.com boards in a wordpress post or page using a short code.

1. Writing a Wordpress
plugin from scratch
Kostas Karolemeas
CTO, pinobo.com

2. Why?
 Sometimes plugins by others suck… because:
 They are not actively developed and have bugs
 They have dependencies’ conflicts
 They do not do the job
 Sometimes you keep repeating the same code in
most of your project.
 Sometimes you have some great functionality that
you want to share with others or even make money
out of it.
Writing a wordpress plugin from scratch Kostas Karolemeas

3. Plugin Files
(1/3)
https://codex.wordpress.org/Writing_a_Plugin
• Standard plugin information
• plugin information header
• License
• Most Plugins use the GPL2 license used
by WordPress or a license compatible with
the GPL2
• Actual Code
my-plugin.php
Writing a wordpress plugin from scratch Kostas Karolemeas

4. Plugin Files
(2/3)
http://www.gnu.org/licenses/gpl-2.0.txt
• GPL2 License
• Required for Wordpress Plugin Repository
gpl-2.0.txt
Writing a wordpress plugin from scratch Kostas Karolemeas

5. Plugin Files
(3/3)
http://wordpress.org/plugins/about/readme.txt
• Plugin info
• Description
• Installation
• FAQ
• Screenshots
• Changelog, etc
readme.txt
Writing a wordpress plugin from scratch Kostas Karolemeas

6. Install Plugin
 Zip the 3 files into my-plugin.zip
 Upload file to install
Writing a wordpress plugin from scratch Kostas Karolemeas

7. Hands-on
Writing a wordpress plugin from scratch Kostas Karolemeas

8. Hands-on
Writing a wordpress plugin from scratch Kostas Karolemeas