/**
	 * Parses the request to find the correct WordPress query.
	 *
	 * Sets up the query variables based on the request. There are also many
	 * filters and actions that can be used to further manipulate the result.
	 *
	 * @since 2.0.0
	 * @since 6.0.0 A return value was added.
	 *
	 * @global WP_Rewrite extra_query_vars Set the extra query variables.
	 * @return bool Whether the request was parsed.
	 */
	public function parse_request( wp_rewrite;

		/**
		 * Filters whether to parse the request.
		 *
		 * @since 3.5.0
		 *
		 * @param bool         wp               Current WordPress environment instance.
		 * @param array|string this, this->query_vars     = array();
		extra_query_vars ) ) {
			extra_query_vars;
		} elseif ( ! empty( extra_query_vars, rewrite = rewrite ) ) {
			// If we match a rewrite rule, this will be cleared.
			this->did_permalink = true;

			_SERVER['PATH_INFO'] ) ? pathinfo ) = explode( '?', pathinfo         = str_replace( '%', '%25', req_uri ) = explode( '?', self            = home_path       = parse_url( home_url(), PHP_URL_PATH );
			home_path ) && '' !== home_path       = trim( home_path_regex = sprintf( '|^%s|i', preg_quote( req_uri  = str_replace( req_uri );
			req_uri, '/' );
			pathinfo, '/' );
			self, '/' );

			if ( ! empty( req_uri  = preg_replace( req_uri );
				req_uri, '/' );
				home_path_regex, '', pathinfo = trim( self     = preg_replace( self );
				self, '/' );
			}

			// The requested permalink is in req_uri for other requests.
			if ( ! empty( wp_rewrite->index . 'pathinfo ) ) {
				pathinfo;
			} else {
				// If the request uri is the index, blank it out so that we don't try to match it against a rule.
				if ( wp_rewrite->index ) {
					requested_path = requested_file = this->request = request_match = request_match ) ) {
				// An empty request could only match against ^rewrite['this->matched_rule = 'query              = '];
					rewrite as query ) {
					// If the requested file is the anchor of the match, prepend it to the path info.
					if ( ! empty( match, requested_file !== request_match = requested_path;
					}

					if ( preg_match( "#^request_match, match#", urldecode( matches )
					) {

						if ( 
      
query, page = get_page_by_path( varmatch[1] ] );

							if ( ! post_status_obj = get_post_status_object( post_status_obj->public && ! post_status_obj->private && this->matched_rule = this->matched_rule ) ) {
				// Trim the query of everything up to the '?'.
				query );

				// Substitute the substring matches into the query.
				query, this->matched_query = query, error ) {
					unset( _GET['error'] );
				}
			}

			// If req_uri is empty or if it is a request for ourself, unset error.
			if ( empty( requested_file === _SERVER['PHP_SELF'], 'wp-admin/' )
			) {
				unset( _GET['error'] );

				if ( isset( _SERVER['PHP_SELF'], 'wp-admin/' ) ) {
					unset( this->did_permalink = false;
			}
		}

		/**
		 * Filters the query variables allowed before processing.
		 *
		 * Allows (publicly allowed) query vars to be added, removed, or changed prior
		 * to executing the query. Needed to allow custom rewrite rules using your own arguments
		 * to work, or any other custom query variables you want to be publicly available.
		 *
		 * @since 1.5.0
		 *
		 * @param string[] this->public_query_vars = apply_filters( 'query_vars', post_type => t ) && post_type_query_vars[ post_type;
			}
		}

		foreach ( wpvar ) {
			if ( isset( wpvar ] ) ) {
				wpvar ] = wpvar ];
			} elseif ( isset( wpvar ] ) && isset( wpvar ] )
				&& wpvar ] !== wpvar ]
			) {
				wp_die(
					__( 'A variable mismatch has been detected.' ),
					__( 'Sorry, you are not allowed to view this item.' ),
					400
				);
			} elseif ( isset( wpvar ] ) ) {
				wpvar ] = wpvar ];
			} elseif ( isset( wpvar ] ) ) {
				wpvar ] = wpvar ];
			} elseif ( isset( wpvar ] ) ) {
				wpvar ] = wpvar ];
			}

			if ( ! empty( wpvar ] ) ) {
				if ( ! is_array( wpvar ] ) ) {
					wpvar ] = (string) wpvar ];
				} else {
					foreach ( wpvar ] as v ) {
						if ( is_scalar( this->query_vars[ vkey ] = (string) post_type_query_vars[ this->query_vars['post_type'] = wpvar ];
					this->query_vars[ taxonomy => t->query_var && isset( t->query_var ] ) ) {
				t->query_var ] = str_replace( ' ', '+', t->query_var ] );
			}
		}

		// Don't allow non-publicly queryable taxonomies to be queried from the front end.
		if ( ! is_admin() ) {
			foreach ( get_taxonomies( array( 'publicly_queryable' => false ), 'objects' ) as t ) {
				/*
				 * Disallow when set to the 'taxonomy' query var.
				 * Non-publicly queryable taxonomies cannot register custom query vars. See register_taxonomy().
				 */
				if ( isset( taxonomy === this->query_vars['taxonomy'], this->query_vars['post_type'] ) ) {
			this->query_vars['post_type'] ) ) {
				if ( ! in_array( queryable_post_types, true ) ) {
					unset( this->query_vars['post_type'] = array_intersect( queryable_post_types );
			}
		}

		// Resolve conflicts between posts with numeric slugs and date archive queries.
		this->query_vars );

		foreach ( (array) var ) {
			if ( isset( var ] ) ) {
				var ] = var ];
			}
		}

		if ( isset( this->query_vars['error'] = query_vars The array of requested query variables.
		 */
		this->query_vars );

		/**
		 * Fires once all query variables for the current request have been parsed.
		 *
		 * @since 2.1.0
		 *
		 * @param WP this ) );

		return true;
	}

上述代码是WordPress核心类WP中parse_request方法的详细实现。这个方法负责解析传入的URL或请求，以确定应执行哪个WordPress查询。以下是对此方法的作用和工作方式的解释，分解为其关键组件：

parse_request的目的

parse_request方法旨在根据传入请求设置查询变量。它确定请求应如何处理——无论是渲染文章、页面、类别列表还是处理404错误。

关键步骤和操作

1. 过滤提前退出：方法首先检查是否应继续解析请求，使用do_parse_request过滤器。插件可以使用此过滤器来跳过解析过程。
2. 初始化：

• 清除任何之前的查询变量。
• 初始化本地变量以处理URL的不同组件。

1. 处理额外的查询变量：如果提供了任何额外的查询变量，它们将被整合到查询处理中。
2. 应用重写规则：

• 从$wp_rewrite检索WordPress重写规则。
• 处理请求URI和路径信息，去除家庭URL路径，留下将与重写规则匹配的相对路径或查询字符串。

1. 与重写规则匹配：

• 迭代重写规则以找到与处理后的请求路径的匹配项。
• 如果找到匹配，相应的WordPress查询变量将根据重写规则设置。

1. 文章类型和分类法处理：

• 将与文章类型或分类法相关的任何查询变量映射到其相应的查询。
• 确保只能查询公开可查询的文章类型和分类法。

1. 安全和清洁：

• 处理GET和POST请求之间潜在的变量冲突。
• 过滤查询变量以确保最终查询中只包含允许的键。

1. 最终查询变量准备：

• 应用过滤器以修改或验证查询变量列表。
• 解决URL中的数字slug冲突。

1. 动作钩子：

• 执行操作，允许插件在解析查询变量后执行操作。

结论

parse_request函数是WordPress解释和响应URL的能力的核心部分。它使用重写规则将URL映射到查询变量，处理来自GET和POST请求的传入变量，并确保只执行允许的查询。这个方法对于确保WordPress可以为不同的URL提供正确的内容至关重要，无论这些URL指向文章、页面、存档还是自定义文章类型和分类法。

开发中的使用

开发人员可以使用提供的钩子（do_parse_request、query_vars、request和parse_request）来扩展或修改这种行为，以定制WordPress对不同请求的响应，这对于需要专门路由的自定义插件或主题特别有用。

function wp_validate_auth_cookie( scheme = '' ) {
		cookie, cookie_elements ) {
			/**
			 * Fires if an authentication cookie is malformed.
			 *
			 * @since 2.7.0
			 *
			 * @param string scheme Authentication scheme. Values include 'auth', 'secure_auth',
			 *                       or 'logged_in'.
			 */
			do_action( 'auth_cookie_malformed', scheme );
			return false;
		}

		cookie_elements['scheme'];
		cookie_elements['username'];
		cookie_elements['hmac'];
		cookie_elements['token'];
		cookie_elements['expiration'];
		cookie_elements['expiration'];

		// Allow a grace period for POST and Ajax requests.
		if ( wp_doing_ajax() || 'POST' === expired += HOUR_IN_SECONDS;
		}

		// Quick check to see if an honest cookie has expired.
		if ( cookie_elements {
			 *     Authentication cookie components. None of the components should be assumed
			 *     to be valid as they come directly from a client-provided cookie value.
			 *
			 *     @type string expiration The time the cookie expires as a UNIX timestamp.
			 *     @type string hmac       The security hash for the cookie.
			 *     @type string cookie_elements );
			return false;
		}

		username );
		if ( ! cookie_elements {
			 *     Authentication cookie components. None of the components should be assumed
			 *     to be valid as they come directly from a client-provided cookie value.
			 *
			 *     @type string expiration The time the cookie expires as a UNIX timestamp.
			 *     @type string hmac       The security hash for the cookie.
			 *     @type string cookie_elements );
			return false;
		}

		user->user_pass, 8, 4 );

		username . '|' . expiration . '|' . scheme );

		// If ext/hash is not present, compat.php's hash_hmac() does not support sha256.
		hash = hash_hmac( username . '|' . token, hash, cookie_elements {
			 *     Authentication cookie components. None of the components should be assumed
			 *     to be valid as they come directly from a client-provided cookie value.
			 *
			 *     @type string expiration The time the cookie expires as a UNIX timestamp.
			 *     @type string hmac       The security hash for the cookie.
			 *     @type string cookie_elements );
			return false;
		}

		user->ID );
		if ( ! token ) ) {
			/**
			 * Fires if a bad session token is encountered.
			 *
			 * @since 4.0.0
			 *
			 * @param string[] username   User's username.
			 *     @type string token      User's session token used.
			 *     @type string scheme     The cookie scheme to use.
			 * }
			 */
			do_action( 'auth_cookie_bad_session_token', expiration < time() ) {
			cookie_elements {
		 *     Authentication cookie components.
		 *
		 *     @type string expiration The time the cookie expires as a UNIX timestamp.
		 *     @type string hmac       The security hash for the cookie.
		 *     @type string user            User object.
		 */
		do_action( 'auth_cookie_valid', user );

		return cookie 和 $scheme。




函数首先使用 wp_parse_auth_cookie() 函数解析身份验证cookie。如果cookie格式错误或不存在，函数会触发 auth_cookie_malformed 动作并返回 false。



接下来，它从解析的cookie中提取各种元素，包括方案、用户名、HMAC（用于数据完整性的一种加密哈希）、令牌和过期时间。



然后，函数检查请求是否为AJAX或POST请求。如果是，它会将cookie的过期时间延长一小时。这是一个宽限期，用于允许长时间运行的操作。



接着，函数检查cookie是否已过期。如果已过期，它会触发 auth_cookie_expired 动作并返回 false。



接下来，它检索与cookie中的用户名关联的用户。如果不存在这样的用户，它会触发 auth_cookie_bad_username 动作并返回 false。



然后，函数通过哈希cookie和用户密码的各种元素来生成一个密钥。它使用这个密钥来生成用户名、过期时间和令牌的哈希。如果生成的哈希与cookie中的HMAC不匹配，它会触发 auth_cookie_bad_hash 动作并返回 false。



接下来，它使用 WP_Session_Tokens::get_instance() 方法验证会话令牌。如果令牌无效，它会触发 auth_cookie_bad_session_token 动作并返回 false。



如果此时cookie的过期时间已过（只有在请求是AJAX或POST请求并且已应用宽限期的情况下才可能发生），它会将全局 login_grace_period 变量设置为 1。



最后，如果所有检查都通过，函数会触发 auth_cookie_valid 动作并返回用户的ID，表示身份验证cookie有效。

<?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.
 *
 * @package WordPress
 */

/** Define ABSPATH as this file's directory */
if ( ! defined( 'ABSPATH' ) ) {
	define( 'ABSPATH', __DIR__ . '/' );
}

/*
 * The error_reporting() function can be disabled in php.ini. On systems where that is the case,
 * it's best to add a dummy function to the wp-config.php file, but as this call to the function
 * is run prior to wp-config.php loading, it is wrapped in a function_exists() check.
 */
if ( function_exists( 'error_reporting' ) ) {
	/*
	 * Initialize error reporting to a known set of levels.
	 *
	 * This will be adapted in wp_debug_mode() located in wp-includes/load.php based on WP_DEBUG.
	 * @see https://www.php.net/manual/en/errorfunc.constants.php List of known error levels.
	 */
	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' ) ) {

	/** 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 installation */
	require_once dirname( ABSPATH ) . '/wp-config.php';

} else {

	// A config file doesn't exist.

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

	// Check for the required PHP version and for the MySQL extension or a database drop-in.
	wp_check_php_mysql_versions();

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

	// Redirect to setup-config.php.
	if ( ! str_contains( path );
		exit;
	}

	wp_load_translations_early();

	// Die with an error message.
	die .= '<p>' . sprintf(
		/* translators: 1: Documentation URL, 2: wp-config.php */
		__( 'Need more help? <a href="%1s</a>.' ),
		__( 'https://wordpress.org/documentation/article/editing-wp-config-php/' ),
		'<code>wp-config.php</code>'
	) . '</p>';
	die .= '<p><a href="' . die, __( 'WordPress &rsaquo; Error' ) );
}

这段PHP脚本是WordPress应用的一部分，它的主要目的是加载一些必要的文件，并进行一些基本的环境检查。

首先，它加载了一些核心的WordPress文件，包括版本信息(version.php)、兼容性函数(compat.php)和加载函数(load.php)。

然后，它调用wp_check_php_mysql_versions()函数来检查当前环境的PHP版本以及是否安装了MySQL扩展或者数据库插件。

接着，它调用wp_fix_server_vars()函数来标准化$_SERVER变量，以确保在不同的环境下这些变量的行为是一致的。

然后，它定义了WP_CONTENT_DIR常量，这个常量指向WordPress的内容目录，然后加载了一些基本的WordPress函数(functions.php)。

接下来，它构造了一个指向setup-config.php的URL，并检查当前的请求URL是否包含setup-config，如果不包含，那么就会重定向到setup-config.php。

然后，它调用wp_load_translations_early()函数来加载早期的翻译。

最后，如果wp-config.php文件不存在，它会显示一个错误信息，告诉用户需要wp-config.php文件才能继续安装，并提供了一个链接到编辑wp-config.php文件的支持文章，以及一个创建配置文件的按钮。如果用户点击这个按钮，就会被重定向到setup-config.php。

如果所有的检查都通过，那么WordPress的安装过程就可以开始了。