WordPressとwp-settings.php

今回はwp-settings.phpを見てみます。

このファイルの役割をまとめるとWordPressが動作するために必要な各種定数・関数・クラスの設定を行うということになります。

長いファイルですがめげずに頑張って見てみることにしますね。

wp-settings.phpの処理内容

<?php

define( 'WPINC', 'wp-includes' );

require( ABSPATH . WPINC . '/load.php' );
require( ABSPATH . WPINC . '/default-constants.php' );

global $wp_version, $wp_db_version, $tinymce_version, $required_php_version, $required_mysql_version;
require( ABSPATH . WPINC . '/version.php' );

wp_initial_constants();
wp_check_php_mysql_versions();

@ini_set( 'magic_quotes_runtime', 0 );
@ini_set( 'magic_quotes_sybase',  0 );

date_default_timezone_set( 'UTC' );
wp_unregister_GLOBALS();
wp_fix_server_vars();
wp_favicon_request();
wp_maintenance();
timer_start();
wp_debug_mode();

if ( WP_CACHE )
	WP_DEBUG ? include( WP_CONTENT_DIR . '/advanced-cache.php' ) : @include( WP_CONTENT_DIR . '/advanced-cache.php' );

wp_set_lang_dir();

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' );
require( ABSPATH . WPINC . '/pomo/mo.php' );

require_wp_db();

$GLOBALS['table_prefix'] = $table_prefix;
wp_set_wpdb_vars();

wp_start_object_cache();

require( ABSPATH . WPINC . '/default-filters.php' );

if ( is_multisite() ) {
	require( ABSPATH . WPINC . '/ms-blogs.php' );
	require( ABSPATH . WPINC . '/ms-settings.php' );
} elseif ( ! defined( 'MULTISITE' ) ) {
	define( 'MULTISITE', false );
}

register_shutdown_function( 'shutdown_action_hook' );

	return false;

require_once( ABSPATH . WPINC . '/l10n.php' );

wp_not_installed();

require( ABSPATH . WPINC . '/class-wp-walker.php' );
require( ABSPATH . WPINC . '/class-wp-ajax-response.php' );
require( ABSPATH . WPINC . '/formatting.php' );
require( ABSPATH . WPINC . '/capabilities.php' );
require( ABSPATH . WPINC . '/query.php' );
require( ABSPATH . WPINC . '/date.php' );
require( ABSPATH . WPINC . '/theme.php' );
require( ABSPATH . WPINC . '/class-wp-theme.php' );
require( ABSPATH . WPINC . '/template.php' );
require( ABSPATH . WPINC . '/user.php' );
require( ABSPATH . WPINC . '/session.php' );
require( ABSPATH . WPINC . '/meta.php' );
require( ABSPATH . WPINC . '/general-template.php' );
require( ABSPATH . WPINC . '/link-template.php' );
require( ABSPATH . WPINC . '/author-template.php' );
require( ABSPATH . WPINC . '/post.php' );
require( ABSPATH . WPINC . '/post-template.php' );
require( ABSPATH . WPINC . '/revision.php' );
require( ABSPATH . WPINC . '/post-formats.php' );
require( ABSPATH . WPINC . '/post-thumbnail-template.php' );
require( ABSPATH . WPINC . '/category.php' );
require( ABSPATH . WPINC . '/category-template.php' );
require( ABSPATH . WPINC . '/comment.php' );
require( ABSPATH . WPINC . '/comment-template.php' );
require( ABSPATH . WPINC . '/rewrite.php' );
require( ABSPATH . WPINC . '/feed.php' );
require( ABSPATH . WPINC . '/bookmark.php' );
require( ABSPATH . WPINC . '/bookmark-template.php' );
require( ABSPATH . WPINC . '/kses.php' );
require( ABSPATH . WPINC . '/cron.php' );
require( ABSPATH . WPINC . '/deprecated.php' );
require( ABSPATH . WPINC . '/script-loader.php' );
require( ABSPATH . WPINC . '/taxonomy.php' );
require( ABSPATH . WPINC . '/update.php' );
require( ABSPATH . WPINC . '/canonical.php' );
require( ABSPATH . WPINC . '/shortcodes.php' );
require( ABSPATH . WPINC . '/class-wp-embed.php' );
require( ABSPATH . WPINC . '/media.php' );
require( ABSPATH . WPINC . '/http.php' );
require( ABSPATH . WPINC . '/class-http.php' );
require( ABSPATH . WPINC . '/widgets.php' );
require( ABSPATH . WPINC . '/nav-menu.php' );
require( ABSPATH . WPINC . '/nav-menu-template.php' );
require( ABSPATH . WPINC . '/admin-bar.php' );

if ( is_multisite() ) {
	require( ABSPATH . WPINC . '/ms-functions.php' );
	require( ABSPATH . WPINC . '/ms-default-filters.php' );
	require( ABSPATH . WPINC . '/ms-deprecated.php' );
}

wp_plugin_directory_constants();

$GLOBALS['wp_plugin_paths'] = array();

foreach ( wp_get_mu_plugins() as $mu_plugin ) {
	include_once( $mu_plugin );
}
unset( $mu_plugin );

if ( is_multisite() ) {
	foreach( wp_get_active_network_plugins() as $network_plugin ) {
		wp_register_plugin_realpath( $network_plugin );
		include_once( $network_plugin );
	}
	unset( $network_plugin );
}

do_action( 'muplugins_loaded' );

if ( is_multisite() )
	ms_cookie_constants(  );

wp_cookie_constants();

wp_ssl_constants();

require( ABSPATH . WPINC . '/vars.php' );

create_initial_taxonomies();
create_initial_post_types();

register_theme_directory( get_theme_root() );

foreach ( wp_get_active_and_valid_plugins() as $plugin ) {
	wp_register_plugin_realpath( $plugin );
	include_once( $plugin );
}
unset( $plugin );

require( ABSPATH . WPINC . '/pluggable.php' );
require( ABSPATH . WPINC . '/pluggable-deprecated.php' );

wp_set_internal_encoding();

if ( WP_CACHE && function_exists( 'wp_cache_postload' ) )
	wp_cache_postload();

do_action( 'plugins_loaded' );

wp_functionality_constants();

wp_magic_quotes();

do_action( 'sanitize_comment_cookies' );

$GLOBALS['wp_the_query'] = new WP_Query();

$GLOBALS['wp_query'] = $GLOBALS['wp_the_query'];

$GLOBALS['wp_rewrite'] = new WP_Rewrite();

$GLOBALS['wp'] = new WP();

$GLOBALS['wp_widget_factory'] = new WP_Widget_Factory();

$GLOBALS['wp_roles'] = new WP_Roles();

do_action( 'setup_theme' );

// Define the template related constants.
wp_templating_constants(  );

// Load the default text localization domain.
load_default_textdomain();

$locale = get_locale();
$locale_file = WP_LANG_DIR . "/$locale.php";
if ( ( 0 === validate_file( $locale ) ) && is_readable( $locale_file ) )
	require( $locale_file );
unset( $locale_file );

require_once( ABSPATH . WPINC . '/locale.php' );

$GLOBALS['wp_locale'] = new WP_Locale();

if ( ! defined( 'WP_INSTALLING' ) || 'wp-activate.php' === $pagenow ) {
	if ( TEMPLATEPATH !== STYLESHEETPATH && file_exists( STYLESHEETPATH . '/functions.php' ) )
		include( STYLESHEETPATH . '/functions.php' );
	if ( file_exists( TEMPLATEPATH . '/functions.php' ) )
		include( TEMPLATEPATH . '/functions.php' );
}

do_action( 'after_setup_theme' );

$GLOBALS['wp']->init();

do_action( 'init' );

if ( is_multisite() ) {
	if ( true !== ( $file = ms_site_check() ) ) {
		require( $file );
		die();
	}
	unset($file);
}

do_action( 'wp_loaded' );

長い。。。

心が折れました。外部のPHPファイルで定義されている（と思われる）定数、変数、関数がありすぎて先にそっちを読まないと訳がわかりません。

本来は一つずつ理解して進みたいんですがこれはそうも言ってられそうにないので主だった処理をまとめるとwp-load.php及びdefault-constants.phpを読み込んで関数や定数を定義することとwp-includesディレクトリ以下のPHPファイルを多数読み込むことの二つになるかと思います。

ということで続けてload.phpとdefault-constants.phpを見ていくことにしたいと思います。