Creating
and
Mark Jaquith
“JAKE-with”
Maintaining
WordPress
@markjaquith Plugins
mark@jaquith.me
markjaquith.com

Why?
Pa erns!
Repo…
Sanity.

Why make
plugins

functions.php
is not the new
my-hacks.php

Plugins separate
functionality from
core and themes

Plugins
comparmentalize
your code

Plugins
[comparmentalize]
your code

Plugins
[compart][mentalize]
your code

Pa erns

<?php
/*
Plugin Name: NAME
*/

Encapsulate
with CLASS

function your_initials_long_plugin_name_do_thing()
vs.
function do_thing()

<?php
/*
Plugin Name: NAME
*/
class CWS_ATL_Plugin {
static $instance;
function __construct() {
self::$instance = $this;
add_action( 'plugins_loaded', array( $this, 'plugins_loaded' ) );
}
function plugins_loaded() {
// Add actions and hooks here
}
}
new CWS_ATL_Plugin;

function plugins_loaded() {
add_filter( 'the_title', array( $this, 'the_title' ), 10, 2 );
add_action( 'init', array( $this, 'init' ), 5 );
add_action( 'omg', array( $this, 'is_really_tedious' ), 11, 3 );
}

if(!class_exists('CWS_Plugin_v2'))
{class CWS_Plugin_v2{function
hook($h){$p=10;$m=$this-
>sanitize_method($h);
$b=func_get_args();unset($b[0]);fo
reach((array)$b as $a)
{if(is_int($a))$p=$a;else $m=$a;}
return add_action($h,array($this,
$m),$p,999);}private function
sanitize_method($m){return
str_replace(array('.','-'),array('
_DOT_','_DASH_'),$m);}}}

<?php
/*
Plugin Name: NAME
*/
if(!class_exists('CWS_Plugin_v2')){class CWS_Plugin_v2{function hook($h){$p=10;$m=$this-
>sanitize_method($h);$b=func_get_args();unset($b[0]);foreach((array)$b as $a){if(is_int($a))$p=$a;else
$m=$a;}return add_action($h,array($this,$m),$p,999);}private function sanitize_method($m){return
str_replace(array('.','-'),array('_DOT_','_DASH_'),$m);}}}
class CWS_ATL_Plugin extends CWS_Plugin_v2 {
static $instance;
function __construct() {
self::$instance = $this;
$this->hook( 'plugins_loaded' );
}
function plugins_loaded() {
// Add actions and hooks here
}
}
new CWS_ATL_Plugin;

// BEFORE
function plugins_loaded() {
add_filter( 'the_title', array( $this, 'the_title' ), 10, 2 );
add_action( 'init', array( $this, 'init' ), 5 );
add_action( 'omg', array( $this, 'is_really_tedious' ), 11, 3 );
}
// AFTER
function plugins_loaded() {
$this->hook( 'the_title' );
$this->hook( 'init', 5 );
$this->hook( 'omg', 'is_really_tedious', 3 );
}

Defer actions

Options in
an array

const OPTIONS = 'my_plugin_option_name';
function get_option( $key ) {
$options = get_option( self::OPTIONS );
if ( isset( $options[$key] ) )
return $options[$key];
}
function set_option( $key, $value ) {
$options = get_option( self::OPTIONS );
$options[$key] = $value;
update_option( self::OPTIONS, $options );
}

Plugins Repo

Community
Karma

Professional
Credibility

Easy reuse
for you

SVN

svn checkout h p://plugins.svn.wordpress.org/{plugin-name}
Plugin dev loop
{
svn up
{hackity hack hack}
svn add {new-files}
svn commit -m '{Message about your changes}'

/trunk/ for development
Tag your releases

/trunk/readme.txt
specifies the stable tag
Stable tag: 2.3

=== Your Plugin ===
Contributors: markjaquith, nacinbot
Donate link: h p://example.com/paypal
Tags: foo, bar
Requires at least: 3.2
Tested up to: 3.3.1
Stable tag: 2.3
Here is a short description of the plugin. This should be no more
than 150 characters. No markup here.

1. Tag in SVN
2. “Repoint” /trunk/readme.txt

Support
forums
wordpress.org/support/view/plugin-commi er/USERNAME

assets/banner-772x250.(jpg|png)

Sanity

Slow down
on the options
cowboyand/or-girl

Say hello to my
li le friend:

Say hello to my
li le friend:
“no”

Encourage
good
behavior

Encourage
g o o d
behavior

Q&A
Mark Jaquith
“JAKE-with”
@markjaquith
mark@jaquith.me
markjaquith.com