WordPressのソースコードを読む（２）

前回に引き続きWordPressのソースコードを読みます。

wp-load.php

<?php
/**
 * Bootstrap file for setting the ABSPATH constant
 * and loading the wp-config.php file. The wp-config.php
 * file will then load the wp-settings.php file, which
 * will then set up the WordPress environment.
 *
 * If the wp-config.php file is not found then an error
 * will be displayed asking the visitor to set up the
 * wp-config.php file.
 *
 * Will also search for wp-config.php in WordPress' parent
 * directory to allow the WordPress directory to remain
 * untouched.
 *
 * @internal This file must be parsable by PHP4.
 *
 * @package WordPress
 */

/** Define ABSPATH as this file's directory */
define( 'ABSPATH', dirname(__FILE__) . '/' );

error_reporting( E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR );

if ( file_exists( ABSPATH . 'wp-config.php') ) {

    /** The config file resides in ABSPATH */
    require_once( ABSPATH . 'wp-config.php' );

} elseif ( file_exists( dirname(ABSPATH) . '/wp-config.php' ) && ! file_exists( dirname(ABSPATH) . '/wp-settings.php' ) ) {

    /** The config file resides one level above ABSPATH but is not part of another install */
    require_once( dirname(ABSPATH) . '/wp-config.php' );

} else {

    // A config file doesn't exist

    define( 'WPINC', 'wp-includes' );
    require_once( ABSPATH . WPINC . '/load.php' );

    // Standardize $_SERVER variables across setups.
    wp_fix_server_vars();

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

    $path = wp_guess_url() . '/wp-admin/setup-config.php';

    /*
    * We're going to redirect to setup-config.php. While this shouldn't result
    * in an infinite loop, that's a silly thing to assume, don't you think? If
    * we're traveling in circles, our last-ditch effort is "Need more help?"
    */
    if ( false === strpos( $_SERVER['REQUEST_URI'], 'setup-config' ) ) {
        header( 'Location: ' . $path );
        exit;
    }

    define( 'WP_CONTENT_DIR', ABSPATH . 'wp-content' );
    require_once( ABSPATH . WPINC . '/version.php' );

    wp_check_php_mysql_versions();
    wp_load_translations_early();

    // Die with an error message
    $die  = __( "There doesn't seem to be a <code>wp-config.php</code> file. I need this before we can get started." ) . '</p>';
    $die .= '<p>' . __( "Need more help? <a href='http://codex.wordpress.org/Editing_wp-config.php'>We got it</a>." ) . '</p>';
    $die .= '<p>' . __( "You can create a <code>wp-config.php</code> file through a web interface, but this doesn't work for all server setups. The safest way is to manually create the file." ) . '</p>';
    $die .= '<p><a href="' . $path . '" class="button button-large">' . __( "Create a Configuration File" ) . '</a>';

    wp_die( $die, __( 'WordPress &rsaquo; Error' ) );
}

wp-load.php。wp-config.phpを読み込む役割のファイルで、wp-config.phpが見つからなければ初期のセットアップ画面にリダイレクトする。WordPressがインストールされたディレクトリのパスを定数にしたり、出力するエラーの設定も行う。wp-config.phpはデータベース周りの設定が記述されているファイルのため割愛。最後にwp-settings.phpを読み込んでいるので、次回はwp-settings.phpの中身を見ていく予定。

• wp-settings.php