学php之翻译wordpress(2)

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 wp-config.php exists in the WordPress root, or if it exists in the root and wp-settings.php
 * doesn't, load wp-config.php. The secondary check for wp-settings.php has the added benefit
 * of avoiding cases where the current directory is a nested installation, e.g. / is WordPress(a)
 * and /blog/ is WordPress(b).
 *
 * If neither set of conditions is true, initiate loading the setup process.
 */
if ( file_exists( ABSPATH . 'wp-config.php') ) {//第一次运行之前是没有wp-config.php这个文件的

    /** 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' ) ) {//第一次运行之前也没有wp-settings.php这个文件

    /** 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
    // 所以第一次就是进来这里
    define( 'WPINC', 'wp-includes' );
    require_once( ABSPATH . WPINC . '/load.php' );// 加载load.php

    // Standardize $_SERVER variables across setups.
    wp_fix_server_vars();// Fix `$_SERVER` variables for various setups.为了处理`$_SERVER`的一些启动变量

    require_once( ABSPATH . WPINC . '/functions.php' );// Main WordPress API,wordpress 的主要api

    $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 );// 跳转到setup-config.php 进入用户配置模式，作者说想避免死循环；
        exit;
    }
    // 已经跳走的话，还要做什么？有可能存在一种情况，执行setup-config.php 的时候执行到这里？其实接下来已经是在打印错误信息了
    define( 'WP_CONTENT_DIR', ABSPATH . 'wp-content' );
    require_once( ABSPATH . WPINC . '/version.php' );// 源码里面都没有这个文件啊

    wp_check_php_mysql_versions();
    wp_load_translations_early();// 大概是和国际化语言有关，具体不知道干嘛，但名字好搞笑，early 你妹啊

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

    wp_die( $die, __( 'WordPress &rsaquo; Error' ) );// 打印错误信息
}