Getting to The Loop - London Wordpress Meetup July 28th

Getting to The Loopworking with themes is commonplace, buthow WP gets there is still seen as magic.it doesn’t need to be that hard. Here’s how itgets there...

Load Plugins DB Template The Loop

Load in ﬁles for a bootstrap phaseset up Pluginsturn the request URL into a DB querychoose a Templatestart The Loop

important ﬁles for this step:• index.php• blog-header.php• wp-load.php• wp-settings.php

index.php<?php/** * Front to the WordPress application. This file doesntdo anything, but loads * wp-blog-header.php which does and tells WordPress toload the theme. */define(WP_USE_THEMES, true);/** Loads the WordPress Environment and Template */require(./wp-blog-header.php);?>

blog-header.php<?php/** * Loads the WordPress environment and template. */ require_once( dirname(__FILE__) . /wp-load.php ); wp(); require_once( ABSPATH . WPINC . /template-loader.php );}?>

wp-load.php<?php/** Define ABSPATH as this files directory */define( ABSPATH, dirname(__FILE__) . / );if ( file_exists( ABSPATH . wp-config.php) ) { require_once( ABSPATH . wp-config.php );} else { wp_die("There doesnt seem to be a wp-config.php file.I need this before we can get started. );}?>

wp-conﬁg.php<?php///** The name of the database for WordPress */define(DB_NAME, database_name_here);/** MySQL database username */define(DB_USER, username_here);/** MySQL database password */define(DB_PASSWORD, password_here);/** Sets up WordPress vars and included files. */require_once(ABSPATH . wp-settings.php);

wp-settings.php<?php// Load early WordPress files.require( ABSPATH . WPINC . /compat.php );require( ABSPATH . WPINC . /functions.php );require( ABSPATH . WPINC . /class-wp.php );require( ABSPATH . WPINC . /class-wp-error.php );require( ABSPATH . WPINC . /plugin.php );// Load most of WordPress.require( ABSPATH . WPINC . /class-wp-ajax-response.php );require( ABSPATH . WPINC . /formatting.php );require( ABSPATH . WPINC . /query.php );

wp-settings.php<?php// Make taxonomies and posts available to plugins and themes.create_initial_taxonomies();create_initial_post_types();// Load active plugins.foreach ( wp_get_active_and_valid_plugins() as $plugin ) { include_once( $plugin );}do_action( plugins_loaded );do_action( setup_theme );do_action( after_setup_theme );do_action( wp_loaded );?>

Plugins

plugins, hooks, actionsadd_action( ‘hook’, ‘function’) do_action(‘admin_notices’) apply_ﬁlteradd_ﬁlter(‘hook’, $template) (‘template_redirect’)

loading plugins

hello_dolly_example.php// Fetch a random song lyric and add it to the pagefunction hello_dolly() { $chosen = hello_dolly_get_lyric(); echo "<p id=dolly>$chosen</p>";}// Now we set that function up to execute when theadmin_notices action is calledadd_action( admin_notices, hello_dolly );

loading plugins

turn the request URL into a DB query• from - http://mysite.com/category/something• to - WP_Query(category=‘something’)

class-wp.php<?phpclass 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)); }

Template

blog-header.php<?php/** * Loads the WordPress environment and template. */ require_once( dirname(__FILE__) . /wp-load.php ); wp(); require_once( ABSPATH . WPINC . /template-loader.php );}?>

template-loader.php<?php// (abridged version)if ( is_single() && $template = get_single_template() ) : elseif ( is_page() && $template = get_page_template() ) : elseif ( is_category() && $template = get_category_template() ) : elseif ( is_tag() && $template = get_tag_template() ) : elseif ( is_author() && $template = get_author_template() ) : elseif ( is_date() && $template = get_date_template() ) : elseif ( is_archive() && $template = get_archive_template() ) :

The Loop

Start The Loop• we now have our template, chosen inside template-loader.php• we now have our query results from wp() in wp-blog-header.php• now hand these over to The Loop - thanks Keith!

Phew! Thank you!c@headshift.com@mrchrisadams

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Getting to The Loop - London Wordpress Meetup July 28th

by Chris Adams on Jul 29, 2011

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Getting to The Loop - London Wordpress Meetup July 28th — Presentation Transcript