From b1842a700cf194da9cbe668b657a62f51fdf4d1b Mon Sep 17 00:00:00 2001
From: ryan <ryan@1a063a9b-81f0-0310-95a4-ce76da25c4cd>
Date: Mon, 25 Jul 2011 20:18:07 +0000
Subject: [PATCH] Optimize parse_request for the home page. Props duck_. see
 #17177

git-svn-id: http://svn.automattic.com/wordpress/trunk@18466 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/class-wp.php | 80 ++++++++++++++++++++--------------------
 1 file changed, 39 insertions(+), 41 deletions(-)

diff --git a/wp-includes/class-wp.php b/wp-includes/class-wp.php
index cf671bd79d..9e4b769b7c 100644
--- a/wp-includes/class-wp.php
+++ b/wp-includes/class-wp.php
@@ -185,54 +185,52 @@ class WP {
 
 			// Look for matches.
 			$request_match = $request;
-			foreach ( (array) $rewrite as $match => $query) {
-				// Don't try to match against AtomPub calls
-				if ( $req_uri == 'wp-app.php' )
-					break;
-
-				// If the requesting file is the anchor of the match, prepend it
-				// to the path info.
-				if ( (! empty($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) ) {
-					// Got a match.
-					$this->matched_rule = $match;
-
-					// 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, $perma_query_vars);
-
-					// If we're processing a 404 request, clear the error var
-					// since we found something.
-					if ( isset($_GET['error']) )
-						unset($_GET['error']);
-
-					if ( isset($error) )
-						unset($error);
-
-					break;
+			if ( empty( $req_uri ) ) {
+				if ( isset( $rewrite['$'] ) ) {
+					$this->matched_rule = '$';
+					$query = $rewrite['$'];
+					$matches = array('');
 				}
+			} else if ( $req_uri != 'wp-app.php' ) {
+				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) ) {
+						// 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.
+				unset( $_GET['error'] );
+				unset( $error );
 			}
 
 			// If req_uri is empty or if it is a request for ourself, unset error.
 			if ( empty($request) || $req_uri == $self || strpos($_SERVER['PHP_SELF'], 'wp-admin/') !== false ) {
-				if ( isset($_GET['error']) )
-					unset($_GET['error']);
-
-				if ( isset($error) )
-					unset($error);
+				unset( $_GET['error'] );
+				unset( $error );
 
 				if ( isset($perma_query_vars) && strpos($_SERVER['PHP_SELF'], 'wp-admin/') !== false )
-					unset($perma_query_vars);
+					unset( $perma_query_vars );
 
 				$this->did_permalink = false;
 			}