/**
* 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 $wp_rewrite WordPress rewrite component.
*
* @param array|string $extra_query_vars Set the extra query variables.
* @return bool Whether the request was parsed.
*/
public function parse_request( $extra_query_vars = '' ) {
global $wp_rewrite;
/**
* Filters whether to parse the request.
*
* @since 3.5.0
*
* @param bool $bool Whether or not to parse the request. Default true.
* @param WP $wp Current WordPress environment instance.
* @param array|string $extra_query_vars Extra passed query variables.
*/
if ( ! apply_filters( 'do_parse_request', true, $this, $extra_query_vars ) ) {
return false;
}
$this->query_vars = array();
$post_type_query_vars = array();
if ( is_array( $extra_query_vars ) ) {
$this->extra_query_vars = & $extra_query_vars;
} elseif ( ! empty( $extra_query_vars ) ) {
parse_str( $extra_query_vars, $this->extra_query_vars );
}
// Process PATH_INFO, REQUEST_URI, and 404 for permalinks.
// Fetch the rewrite rules.
$rewrite = $wp_rewrite->wp_rewrite_rules();
if ( ! empty( $rewrite ) ) {
// If we match a rewrite rule, this will be cleared.
$error = '404';
$this->did_permalink = true;
$pathinfo = isset( $_SERVER['PATH_INFO'] ) ? $_SERVER['PATH_INFO'] : '';
list( $pathinfo ) = explode( '?', $pathinfo );
$pathinfo = str_replace( '%', '%25', $pathinfo );
list( $req_uri ) = explode( '?', $_SERVER['REQUEST_URI'] );
$self = $_SERVER['PHP_SELF'];
$home_path = parse_url( home_url(), PHP_URL_PATH );
$home_path_regex = '';
if ( is_string( $home_path ) && '' !== $home_path ) {
$home_path = trim( $home_path, '/' );
$home_path_regex = sprintf( '|^%s|i', preg_quote( $home_path, '|' ) );
}
/*
* Trim path info from the end and the leading home path from the front.
* For path info requests, this leaves us with the requesting filename, if any.
* For 404 requests, this leaves us with the requested permalink.
*/
$req_uri = str_replace( $pathinfo, '', $req_uri );
$req_uri = trim( $req_uri, '/' );
$pathinfo = trim( $pathinfo, '/' );
$self = trim( $self, '/' );
if ( ! empty( $home_path_regex ) ) {
$req_uri = preg_replace( $home_path_regex, '', $req_uri );
$req_uri = trim( $req_uri, '/' );
$pathinfo = preg_replace( $home_path_regex, '', $pathinfo );
$pathinfo = trim( $pathinfo, '/' );
$self = preg_replace( $home_path_regex, '', $self );
$self = trim( $self, '/' );
}
// The requested permalink is in $pathinfo for path info requests and $req_uri for other requests.
if ( ! empty( $pathinfo ) && ! preg_match( '|^.*' . $wp_rewrite->index . '$|', $pathinfo ) ) {
$requested_path = $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 ( $req_uri === $wp_rewrite->index ) {
$req_uri = '';
}
$requested_path = $req_uri;
}
$requested_file = $req_uri;
$this->request = $requested_path;
// Look for matches.
$request_match = $requested_path;
if ( empty( $request_match ) ) {
// An empty request could only match against ^$ regex.
if ( isset( $rewrite['$'] ) ) {
$this->matched_rule = '$';
$query = $rewrite['$'];
$matches = array( '' );
}
} else {
foreach ( (array) $rewrite as $match => $query ) {
// If the requested file is the anchor of the match, prepend it to the path info.
if ( ! empty( $requested_file )
&& str_starts_with( $match, $requested_file )
&& $requested_file !== $requested_path
) {
$request_match = $requested_file . '/' . $requested_path;
}
if ( preg_match( "#^$match#", $request_match, $matches )
|| preg_match( "#^$match#", urldecode( $request_match ), $matches )
) {
if ( $wp_rewrite->use_verbose_page_rules
&& preg_match( '/pagename=\$matches\[([0-9]+)\]/', $query, $varmatch )
) {
// This is a verbose page match, let's check to be sure about it.
$page = get_page_by_path( $matches[ $varmatch[1] ] );
if ( ! $page ) {
continue;
}
$post_status_obj = get_post_status_object( $page->post_status );
if ( ! $post_status_obj->public && ! $post_status_obj->protected
&& ! $post_status_obj->private && $post_status_obj->exclude_from_search
) {
continue;
}
}
// Got a match.
$this->matched_rule = $match;
break;
}
}
}
if ( ! empty( $this->matched_rule ) ) {
// Trim the query of everything up to the '?'.
$query = preg_replace( '!^.+\?!', '', $query );
// Substitute the substring matches into the query.
$query = addslashes( WP_MatchesMapRegex::apply( $query, $matches ) );
$this->matched_query = $query;
// Parse the query.
parse_str( $query, $perma_query_vars );
// If we're processing a 404 request, clear the error var since we found something.
if ( '404' === $error ) {
unset( $error, $_GET['error'] );
}
}
// If req_uri is empty or if it is a request for ourself, unset error.
if ( empty( $requested_path ) || $requested_file === $self
|| str_contains( $_SERVER['PHP_SELF'], 'wp-admin/' )
) {
unset( $error, $_GET['error'] );
if ( isset( $perma_query_vars ) && str_contains( $_SERVER['PHP_SELF'], 'wp-admin/' ) ) {
unset( $perma_query_vars );
}
$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[] $public_query_vars The array of allowed query variable names.
*/
$this->public_query_vars = apply_filters( 'query_vars', $this->public_query_vars );
foreach ( get_post_types( array(), 'objects' ) as $post_type => $t ) {
if ( is_post_type_viewable( $t ) && $t->query_var ) {
$post_type_query_vars[ $t->query_var ] = $post_type;
}
}
foreach ( $this->public_query_vars as $wpvar ) {
if ( isset( $this->extra_query_vars[ $wpvar ] ) ) {
$this->query_vars[ $wpvar ] = $this->extra_query_vars[ $wpvar ];
} elseif ( isset( $_GET[ $wpvar ] ) && isset( $_POST[ $wpvar ] )
&& $_GET[ $wpvar ] !== $_POST[ $wpvar ]
) {
wp_die(
__( 'A variable mismatch has been detected.' ),
__( 'Sorry, you are not allowed to view this item.' ),
400
);
} elseif ( isset( $_POST[ $wpvar ] ) ) {
$this->query_vars[ $wpvar ] = $_POST[ $wpvar ];
} elseif ( isset( $_GET[ $wpvar ] ) ) {
$this->query_vars[ $wpvar ] = $_GET[ $wpvar ];
} elseif ( isset( $perma_query_vars[ $wpvar ] ) ) {
$this->query_vars[ $wpvar ] = $perma_query_vars[ $wpvar ];
}
if ( ! empty( $this->query_vars[ $wpvar ] ) ) {
if ( ! is_array( $this->query_vars[ $wpvar ] ) ) {
$this->query_vars[ $wpvar ] = (string) $this->query_vars[ $wpvar ];
} else {
foreach ( $this->query_vars[ $wpvar ] as $vkey => $v ) {
if ( is_scalar( $v ) ) {
$this->query_vars[ $wpvar ][ $vkey ] = (string) $v;
}
}
}
if ( isset( $post_type_query_vars[ $wpvar ] ) ) {
$this->query_vars['post_type'] = $post_type_query_vars[ $wpvar ];
$this->query_vars['name'] = $this->query_vars[ $wpvar ];
}
}
}
// Convert urldecoded spaces back into '+'.
foreach ( get_taxonomies( array(), 'objects' ) as $taxonomy => $t ) {
if ( $t->query_var && isset( $this->query_vars[ $t->query_var ] ) ) {
$this->query_vars[ $t->query_var ] = str_replace( ' ', '+', $this->query_vars[ $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 $taxonomy => $t ) {
/*
* Disallow when set to the 'taxonomy' query var.
* Non-publicly queryable taxonomies cannot register custom query vars. See register_taxonomy().
*/
if ( isset( $this->query_vars['taxonomy'] ) && $taxonomy === $this->query_vars['taxonomy'] ) {
unset( $this->query_vars['taxonomy'], $this->query_vars['term'] );
}
}
}
// Limit publicly queried post_types to those that are 'publicly_queryable'.
if ( isset( $this->query_vars['post_type'] ) ) {
$queryable_post_types = get_post_types( array( 'publicly_queryable' => true ) );
if ( ! is_array( $this->query_vars['post_type'] ) ) {
if ( ! in_array( $this->query_vars['post_type'], $queryable_post_types, true ) ) {
unset( $this->query_vars['post_type'] );
}
} else {
$this->query_vars['post_type'] = array_intersect( $this->query_vars['post_type'], $queryable_post_types );
}
}
// Resolve conflicts between posts with numeric slugs and date archive queries.
$this->query_vars = wp_resolve_numeric_slug_conflicts( $this->query_vars );
foreach ( (array) $this->private_query_vars as $var ) {
if ( isset( $this->extra_query_vars[ $var ] ) ) {
$this->query_vars[ $var ] = $this->extra_query_vars[ $var ];
}
}
if ( isset( $error ) ) {
$this->query_vars['error'] = $error;
}
/**
* Filters the array of parsed query variables.
*
* @since 2.1.0
*
* @param array $query_vars The array of requested query variables.
*/
$this->query_vars = apply_filters( 'request', $this->query_vars );
/**
* Fires once all query variables for the current request have been parsed.
*
* @since 2.1.0
*
* @param WP $wp Current WordPress environment instance (passed by reference).
*/
do_action_ref_array( 'parse_request', array( &$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
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 动作钩子：
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。
