Doing Things the WordPress Way

DOING THINGS THE

WordPress
WAY

By Matt Wiebe
Theme Designer, Plugin Developer
Soma Design – http://somadesign.ca/
Twitter – @mattwiebe

THE WP WAY
★ Loading JS/CSS
★ HTTP Requests

THE WP WAY
★ Loading JS/CSS
★ HTTP Requests
★ JSON

THE WP WAY
★ Loading JS/CSS
★ HTTP Requests
★ JSON
★ Email

THE WP WAY
★ Loading JS/CSS
★ HTTP Requests
★ JSON
★ Email
★ Query Arguments

LOADING JS/CSS
<script type="text/javascript" src="path/to/script.js" />
<link rel="stylesheet" href="path/to/style.css" 
type="text/css" media="all" />

LOADING JS/CSS
<script type="text/javascript" src="path/to/script.js" />
<link rel="stylesheet" href="path/to/style.css" 
type="text/css" media="all" />

NEVER AGAIN

LOADING JS/CSS
wp_enqueue_script( 'script‐name', 
'http://path/to/script.js', 
array('jquery'), '1.0', true );

Script ID – tells WP when to load,
helps track dependencies

LOADING JS/CSS

Script URL. Can be external.

LOADING JS/CSS

(Optional) Dependencies. Reference
the Script IDs scripts that should be
loaded before this one. (WP has many
built-in)

LOADING JS/CSS

(Optional) Version #.

LOADING JS/CSS

(Optional) Load in Footer. Defaults to
false, which loads in <head />

LOADING JS/CSS
// Or, register first, enqueue later

wp_register_script( 'script‐name', 

wp_enqueue_script( 'script‐name' );

LOADING JS/CSS
// Similar for styles

wp_enqueue_style( 'style‐name', 'http://
path/to/style.css', array('deps'), '1.0', 
'media type');

HTTP REQUESTS
// How does this curl $h|† work again?

HTTP REQUESTS

$c = curl_init();
curl_setop('ohcrapicantremember');

HTTP REQUESTS

$c = curl_init();
curl_setop('ohcrapicantremember');

// Screw it

HTTP REQUESTS

★ Not all PHP environments have
cURL installed

HTTP REQUESTS

cURL installed
★ The WP_Http class Standardizes the
HTTP requests for WordPress. Handles
cookies, gzip encoding and decoding,
chunk decoding…

HTTP REQUESTS

cURL installed
★ The WP_Http class Standardizes the
HTTP requests for WordPress. Handles
cookies, gzip encoding and decoding,
chunk decoding…
★ wp_remote_* functions provided

HTTP REQUESTS
// HTTP GET request
$get = wp_remote_get($url);

HTTP REQUESTS

// HTTP POST request
$post = wp_remote_post($url, $args);

HTTP REQUESTS


// Just the response body
$body = wp_remote_retrieve_body( $get );

HTTP REQUESTS


// Just the response body
$body = wp_remote_retrieve_body( $get );

// Just the response header
$h = wp_remote_retrieve_header( $get );

JSON
★ JSON (JavaScript Object Notation)
is the preferred way to exchange data

JSON
★ PHP 5.2 has json_encode() and
json_decode() functions

JSON
★ Many WP users are on earlier
versions of PHP

JSON
★ Many WP users are on earlier
versions of PHP
★ WP has a backwards compatibility
layer for PHP < 5.2 (since 2.9)

EMAIL
★ Sending email sucks
★ WP's mail sending functionality
makes it suck less

EMAIL
★ Sending email sucks
★ WP's mail sending functionality
makes it suck less
★ Centralizes all email so that it can
be overridden/manipulated by plugins

EMAIL
/**
 * $to email address(es) to send to.
 * $subject Email subject
 * $message Message contents
 * $headers Optional. Additional headers.
 * $attachments Optional. Files to
 * attach.
 */

$success = wp_mail( $to, $subject, 
$message, $headers, $attachments );

QUERY ARGUMENTS
// already have $some_url defined
// want to add a query string

QUERY ARGUMENTS

$some_url .= "?get=something+awesome";

QUERY ARGUMENTS


// what if $some_url already had a "?" ?

QUERY ARGUMENTS


// what if $some_url already had a "?" ?
// add_query_arg() to the rescue

$some_url = add_query_arg( "get", 
"something awesome", $some_url );

QUERY ARGUMENTS
// awesomer syntax

QUERY ARGUMENTS
$params = array(
"get" => "something awesome",
"for" => "Matt",
"because" => "He's awesome"
);

QUERY ARGUMENTS
);

$url = add_query_arg( $params, $url );

QUERY ARGUMENTS
);

$url = add_query_arg( $params, $url );

// http://amazon.com/?get=something
+awesome&for=Matt&because=He's+awesome

BONUS ROUND
// can't remember if your URL has
// a slash at the end?

$slashed_url = trailingslashit($url);

// No slashes

$unslashed_url = untrailingslashit($url);

BONUS ROUND
/** 
 * merging arguments and defaults?
 * $defaults array of defaults
 * $args accepts an array or query
 * string. eg cat_name=moo&tag=cow
 * @return an array
*/

$args = wp_parse_args( $defaults, $args);

BONUS ROUND
// Override WP's jQuery with Google CDN 

add_action( 'wp_enqueue_scripts', 
'sd_google_cdn');
function sd_google_cdn() {
wp_deregister_script( 'jquery' );

wp_enqueue_script( 'jquery', 'http://
ajax.googleapis.com/ajax/libs/jquery/
1.4.4/jquery.min.js', array(), 
'1.4.4', true );
}

NOW YOU’LL DO THINGS THE

WordPress WAY

THANKS!
By Matt Wiebe
Theme Designer, Plugin Developer
Soma Design – http://somadesign.ca/
Twitter – @mattwiebe

Doing Things the WordPress Way

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