WordPress is not a Content Management System

Do not use it for your websites!

thomas@gasc.fr @methylbro

Tuesday 6th of May 2014 @LaCantine_Tlse, Toulouse

involvededition=2013

spokeedition=2012

Who I am ?

name=Thomas G.type=person

spokeedition=11/12/2012

name=Human Talkstype=event

name=PHP Tourtype=event

name=Paris Webtype=event

name=Sud Webtype=event

attendeeedition=2012, 2013

name=Forum PHPtype=event

membervolunteer=2012, 2013office=2014

name=AFUPtype=organization

attendeeedition=2013, 2014

attendeeedition=2012, 2013

attendeeedition=2014

organized

14

organized

3

2

2

2

inspired inspired

http://methylbro.fr/

WordPress is web software you can use to create a beautiful website or blog

wordpress.org

WordPress is shit!

5 horribles things in WordPress

about themes, metadata, plugins, core, ...

wp-content/themes/

<?php

// WordPress template

while($latest_cat_post->have_posts()) :

$latest_cat_post->the_post();the_title();the_excerpt();

endwhile;

<?php

// as it should be

foreach ($lastest_posts as $post) {

echo $post->title;echo $post->excerpt;

}

http://codex.wordpress.org/Global_Variables

Spaghetti Codehttp://en.wikipedia.org/wiki/Spaghetti_code

wp-includes/meta.php

/* post's enhancement with metadata */

function add_metadata(

string $meta_type, int $object_id,string $meta_key,mixed $meta_value, bool $unique = false

);

function get_metadata(

string $meta_type,int $object_id,string $meta_key = ‘’,bool $single = false

);

<?php

// define a connexion between 2 posts

$post_id = 14;$next_post_id = 17;

add_metadata(‘post’, $post_id, ‘next_post’, $next_post_id

);

// what’s happen if … ?

wp_delete_post( $next_post_id );

http://codex.wordpress.org/Function_Reference/the_meta

Video

Content Managing System

<Content> Article

Song

Video Clip

Lyrics

http://en.wikipedia.org/wiki/Content_management_system

wp-includes/plugin.php

<?php

// how WordPress plugin works

function plugin_footer() {

echo ‘hello world !’;}

add_action( ‘wp_footer’ , ‘plugin_footer );

do_action( ‘wp_footer’ );

<?php

// how plugins should works

class Footer extends SPLSubject { /*...*/ }class FooterPlugin extends SPLObserver{

function update() {

echo ‘hello world !’;}

}

$wp_footer = new Footer();

$wp_footer->attach( new FooterPlugin() );

$wp_footer->notify();

http://codex.wordpress.org/Plugin_API

SPLObserver Interface

: SPLSubject : SPLObserver

notify()

attach()

update()

http://www.php.net/manual/en/class.splobserver.php

wp-includes/class-wp.phphttp://develop.svn.wordpress.org/branches/3.9/src/wp-includes/class-wp.php

<?php

class WP {

// ...

function main( $query_args = '' ) {

$this->init();$this->parse_request($query_args);$this->send_headers();$this->query_posts();$this->handle_404();$this->register_globals();

do_action_ref_array('wp', array( &$this )

);}

}

// ...

require '/template-loader.php' ;

1. initiatebuild WP_User instance into $current_user global

2. parse requestretrieves params into self::$query_vars

3. send http headerssend headers and terminate if needed

4. retrieves infos from databaseparse and execute $wp_query and then retrieves posts

5. handle 404changes the http headers already sent if a not found error occurred during the request

6. register lot of globalsretrieves posts data and set them into globals vars

7. send signal to pluginssay to the plugins that they can do things here

8. render php script as templateexecute a php script as a template and directly output the result

HTTPKernel

Request requestresolve

controller

controller

resolve arguments

view

response Response

terminate

exception

Sub-Request

Call Controller

exception

“sub-response” content

response?

http://symfony.com/doc/current/components/http_kernel/introduction.html

wp-includes/class-wp.php

<?php

class WP {

// ...

function query_posts() {

global $wp_the_query;

$this->build_query_string();

$wp_the_query->query($this->query_vars

); }

}

not even passed as parameter !! WTF ?!

http://develop.svn.wordpress.org/branches/3.9/src/wp-includes/class-wp.php

Dependency Injectionhttp://php-di.org/doc/understanding-di.html

It’s all about interoperability

PHP Framework Interoperability Group

http://www.php-fig.org/

All these things are in Drupal 8

Drupal 8

http://symfony.com/blog/symfony2-meets-drupal-8

- EventDispatcher- HTTPKernel- DependencyInjection

and more ...

Use cool tools

terminal

cool toolsand even more

More powerful than WordPress templates

Template Engine

CSS Framework

∞templatesImage

Editor

infinity

More powerful than WordPress plugins

PackagistComposer

30 000+packages

http://getcomposer.org/doc/00-intro.md

Conclusion: Don’t be afraid (to code) !

Thank you, Any questions?

Illustrations :http://thenounproject.com/

www.afup.orgFrench Association of PHP Users

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www.phptour.orgLyon, France

June, 23rd & 24th 2014