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WordPress Extension Studio
An extension development guide for the elegant personal publishing system.
General
WordPress Architecture
Execution Paths and Includes
Hooks and Filters
Text Flow
Sorcery: Developing Plugins
Plugin Entry Points: Filters, Hooks and Tricks
List of Filters
Direct Calls in Templates
Using do_action to degrade gracefully
Sample Plugins
Output Buffering
Bewitchery: Creating Themes
Development Reference
Hacking WordPress
WP-Themes.org and WP-Plugins.org
Subversion
Tags, Trunk, Branches
TortoiseSVN
Trac