这是我用来在 WordPress 4.2.2 上使用的最终代码，非常感谢 Chris：
/**
* An extension of the global WP object class for URL parsing / query_var generating ability over AJAX
*
* Essentially, it lets you specify a url.
*
* Example of use:
*
* global $wp;
* $wp = new AJAX_WP();
* $wp->main( $url );
*
* @since 2015-June-2
*/
class AJAX_WP extends WP {
/**
* Parse request to find 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
*
* @param array|string $extra_query_vars Set the extra query variables.
*/
public function parse_request( $url ) {
global $wp_rewrite;
//validate url
if(empty($url))
return false;
//sanitize
$url = filter_var($url, FILTER_SANITIZE_URL);
/**
* Filter whether to parse the request.
*
* @since 3.5.0
*
* @param bool $bool Whether or not to parse the request. Default true.
* @param WP $this 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;
$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 = trim( parse_url( home_url(), PHP_URL_PATH ), '/' );*/
//parse url
$_url = parse_url($url);
//set path info
$pathinfo = $_url['path'];
$pathinfo_array = explode('?', $pathinfo);
$pathinfo = str_replace("%", "%25", $pathinfo_array[0]);
//req_uri
$req_uri = $_url['path'];
$req_uri_array = explode('?', $req_uri);
$req_uri = $req_uri_array[0];
//self
$self = $_url['path'];
$home_path = parse_url(home_url());
if ( isset($home_path['path']) )
$home_path = $home_path['path'];
else
$home_path = '';
$home_path = trim($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, '/');
$req_uri = preg_replace("|^$home_path|i", '', $req_uri);
$req_uri = trim($req_uri, '/');
$pathinfo = trim($pathinfo, '/');
$pathinfo = preg_replace("|^$home_path|i", '', $pathinfo);
$pathinfo = trim($pathinfo, '/');
$self = trim($self, '/');
$self = preg_replace("|^$home_path|i", '', $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) ) {
$request = $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 = '';
$request = $req_uri;
}
$this->request = $request;
// Look for matches.
$request_match = $request;
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 => $query ) {
// If the requesting file is the anchor of the match, prepend it to the path info.
if ( ! empty($req_uri) && strpos($match, $req_uri) === 0 && $req_uri != $request )
$request_match = $req_uri . '/' . $request;
if ( preg_match("#^$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.
if ( ! get_page_by_path( $matches[ $varmatch[1] ] ) )
continue;
}
// Got a match.
$this->matched_rule = $match;
break;
}
}
}
if ( isset( $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, $_GET['error'] );
}
// If req_uri is empty or if it is a request for ourself, unset error.
if ( empty($request) || $req_uri == $self ) {
unset( $error, $_GET['error'] );
/*
Not doing this — it's AJAX and will always be true
if ( isset($perma_query_vars) && strpos($_SERVER['PHP_SELF'], 'wp-admin/') !== false ) {
unset( $perma_query_vars );
}*/
$this->did_permalink = false;
}
}
/**
* Filter the query variables whitelist 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 array $public_query_vars The array of whitelisted query variables.
*/
$this->public_query_vars = apply_filters( 'query_vars', $this->public_query_vars );
foreach ( get_post_types( array(), 'objects' ) as $post_type => $t )
if ( $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( $_POST[$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_object( $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] );
// 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 ) )
unset( $this->query_vars['post_type'] );
} else {
$this->query_vars['post_type'] = array_intersect( $this->query_vars['post_type'], $queryable_post_types );
}
}
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;
/**
* Filter 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', $this->query_vars );
/**
* Fires once all query variables for the current request have been parsed.
*
* @since 2.1.0
*
* @param WP &$this Current WordPress environment instance (passed by reference).
*/
do_action_ref_array( 'parse_request', array( &$this ) );
}
/**
* Sets up all of the variables required by the WordPress environment.
*
* The action 'wp' has one parameter that references the WP object. It
* allows for accessing the properties and methods to further manipulate the
* object.
*
* @since 2.0.0
*
* @param string|array $query_args Passed to {@link parse_request()}
*/
public function main( $url ) {
$this->init();
$this->parse_request( $url );
$this->send_headers();
$this->query_posts();
$this->handle_404();
$this->register_globals();
/**
* Fires once the WordPress environment has been set up.
*
* @since 2.1.0
*
* @param WP &$this Current WordPress environment instance (passed by reference).
*/
do_action_ref_array( 'wp', array( &$this ) );
}
}
此外，我必须添加此过滤器以使其全部正常工作：
/**
* Make sure that all the post types are available as query variables
*
* This fixes a problem with AJAX_WP not returning custom post types.
*
* @since 2015-June-2
* @param array $public_vars
* @return array
*/
function ananda_ajax_public_query_post_types( $public_vars ) {
return array_merge( get_post_types( array('publicly_queryable' => true) ), $public_vars );
}
这是添加的实际过滤器：
add_filter( 'query_vars', 'ananda_ajax_public_query_post_types', 10, 1 );