root/tags/1.5.1/wp-blog-header.php

<?php

if (! isset($wp_did_header)):
if ( !file_exists( dirname(__FILE__) . '/wp-config.php') ) {
    if ( strstr( $_SERVER['PHP_SELF'], 'wp-admin') ) $path = '';
    else $path = 'wp-admin/';
    die("There doesn't seem to be a <code>wp-config.php</code> file. I need this before we can get started. Need more help? <a href='http://wordpress.org/docs/faq/#wp-config'>We got it</a>. You can <a href='{$path}setup-config.php'>create a <code>wp-config.php</code> file through a web interface</a>, but this doesn't work for all server setups. The safest way is to manually create the file.");
}

$wp_did_header = true;

require_once( dirname(__FILE__) . '/wp-config.php');

$query_vars = array();

// Process PATH_INFO and 404.
if ((isset($_GET['error']) && $_GET['error'] == '404') ||
        ((! empty($_SERVER['PATH_INFO'])) &&
        ('/' != $_SERVER['PATH_INFO']) &&
         (false === strpos($_SERVER['PATH_INFO'], '.php'))
        )) {

    // If we match a rewrite rule, this will be cleared.
    $error = '404';

    // Fetch the rewrite rules.
    $rewrite = $wp_rewrite->wp_rewrite_rules();

    if (! empty($rewrite)) {
        $pathinfo = $_SERVER['PATH_INFO'];
        $req_uri = $_SERVER['REQUEST_URI'];      
        $home_path = parse_url(get_settings('home'));
        $home_path = $home_path['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);
        $req_uri = str_replace($home_path, '', $req_uri);
        $req_uri = trim($req_uri, '/');
        $pathinfo = trim($pathinfo, '/');

        // The requested permalink is in $pathinfo for path info requests and
        //  $req_uri for other requests.
        if (! empty($pathinfo)) {
            $request = $pathinfo;
        } else {
            $request = $req_uri;
        }

        // Look for matches.
        $request_match = $request;
        foreach ($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)) {
          $request_match = $req_uri . '/' . $request;
        }

            if (preg_match("!^$match!", $request_match, $matches)) {
                // Got a match.
                // Trim the query of everything up to the '?'.
                $query = preg_replace("!^.+\?!", '', $query);

                // Substitute the substring matches into the query.
                eval("\$query = \"$query\";");

                // Parse the query.
                parse_str($query, $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;
            }
        }
    }
 }

$wpvarstoreset = array('m','p','posts','w', 'cat','withcomments','s','search','exact', 'sentence', 'debug', 'calendar','page','paged','more','tb', 'pb','author','order','orderby', 'year', 'monthnum', 'day', 'hour', 'minute', 'second', 'name', 'category_name', 'feed', 'author_name', 'static', 'pagename', 'page_id', 'error', 'comments_popup');

$wpvarstoreset = apply_filters('query_vars', $wpvarstoreset);

for ($i=0; $i<count($wpvarstoreset); $i += 1) {
    $wpvar = $wpvarstoreset[$i];
    if (!isset($$wpvar)) {
        if (empty($_POST[$wpvar])) {
            if (empty($_GET[$wpvar]) && empty($query_vars[$wpvar])) {
                $$wpvar = '';
            } elseif (!empty($_GET[$wpvar])) {
                $$wpvar = $_GET[$wpvar];
            } else {
                $$wpvar = $query_vars[$wpvar];
            }
        } else {
            $$wpvar = $_POST[$wpvar];
        }
    }
}

// Sending HTTP headers

if ( !empty($error) && '404' == $error ) {
    if ( preg_match('/cgi/', php_sapi_name()) )
        @header('Status: 404 Not Found');
    else
        @header('HTTP/1.x 404 Not Found');
 } else if ( empty($feed) ) {
    @header('X-Pingback: '. get_bloginfo('pingback_url'));
    @header('Content-type: ' . get_option('html_type') . '; charset=' . get_option('blog_charset'));
} else {
    // We're showing a feed, so WP is indeed the only thing that last changed
    if ( $withcomments )
        $wp_last_modified = mysql2date('D, d M Y H:i:s', get_lastcommentmodified('GMT'), 0).' GMT';
    else 
        $wp_last_modified = mysql2date('D, d M Y H:i:s', get_lastpostmodified('GMT'), 0).' GMT';
    $wp_etag = '"' . md5($wp_last_modified) . '"';
    @header("Last-Modified: $wp_last_modified");
    @header("ETag: $wp_etag");
    @header('X-Pingback: ' . get_bloginfo('pingback_url'));

    // Support for Conditional GET
    if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) $client_last_modified = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
    else $client_last_modified = false;
    if (isset($_SERVER['HTTP_IF_NONE_MATCH'])) $client_etag = stripslashes($_SERVER['HTTP_IF_NONE_MATCH']);
    else $client_etag = false;

    if ( ($client_last_modified && $client_etag) ?
        ((strtotime($client_last_modified) >= strtotime($wp_last_modified)) && ($client_etag == $wp_etag)) :
        ((strtotime($client_last_modified) >= strtotime($wp_last_modified)) || ($client_etag == $wp_etag)) ) {
        if ( preg_match('/cgi/',php_sapi_name()) ) {
            header('Status: 304 Not Modified');
            echo "\r\n\r\n";
            exit;
        } else {
            if ( version_compare(phpversion(), '4.3.0', '>=') )
                header('Not Modified', TRUE, 304);
            else
                header('HTTP/1.x 304 Not Modified');
            exit;
        }
    }
}

$use_gzipcompression = get_settings('gzipcompression');

$more_wpvars = array('posts_per_page', 'posts_per_archive_page', 'what_to_show', 'showposts', 'nopaging');

// Construct the query string.
$query_string = '';
foreach (array_merge($wpvarstoreset, $more_wpvars) as $wpvar) {
    if ($$wpvar != '') {
        $query_string .= (strlen($query_string) < 1) ? '' : '&';
        $query_string .= $wpvar . '=' . rawurlencode($$wpvar);
    }
}

$query_string = apply_filters('query_string', $query_string);

update_category_cache();
get_currentuserinfo();

// Call query posts to do the work.
$posts = & query_posts($query_string);

// Extract updated query vars back into global namespace.
extract($wp_query->query_vars);

if ( is_single() || is_page() ) {
    $more = 1;
    $single = 1;
}

// Issue a 404 if a permalink request doesn't match any posts.  Don't issue a
// 404 if one was already issued, if the request was a search, or if the
// request was a regular query string request rather than a permalink request.
if ( (0 == count($posts)) && !is_404() && !is_search()
        && ( isset($rewrite) || (!empty($_SERVER['QUERY_STRING']) &&
        (false === strpos($_SERVER['REQUEST_URI'], '?'))) ) ) {
    $wp_query->is_404 = true;
    if ( preg_match('/cgi/', php_sapi_name()) )
        @header('Status: 404 Not Found');
    else
        @header('HTTP/1.x 404 Not Found');
}

if ($pagenow != 'post.php' && $pagenow != 'edit.php') {
    if ( get_settings('gzipcompression') ) 
        gzip_compression();
}

// Template redirection
if ( defined('WP_USE_THEMES') && constant('WP_USE_THEMES') ) {
    do_action('template_redirect');
    if ( is_feed() && empty($doing_rss) ) {
        include(ABSPATH . '/wp-feed.php');
        exit;
    } else if ( is_trackback() && empty($doing_trackback) ) {
        include(ABSPATH . '/wp-trackback.php');
        exit;
    } else if ( is_404() && get_404_template() ) {
        include(get_404_template());
        exit;
    } else if ( is_search() && get_search_template() ) {
        include(get_search_template());
        exit;
    } else if ( is_home() && get_home_template() ) {
        include(get_home_template());
        exit;
    } else if ( is_single() && get_single_template() ) {
        include(get_single_template());
        exit;
    } else if ( is_page() && get_page_template() ) {
        include(get_page_template());
        exit;
    } else if ( is_category() && get_category_template()) {
        include(get_category_template());
        exit;        
    } else if ( is_author() && get_author_template() ) {
        include(get_author_template());
        exit;
    } else if ( is_date() && get_date_template() ) {
        include(get_date_template());
        exit;
    } else if ( is_archive() && get_archive_template() ) {
        include(get_archive_template());
        exit;
    } else if ( is_comments_popup() && get_comments_popup_template() ) {
        include(get_comments_popup_template());
        exit;
    } else if ( is_paged() && get_paged_template() ) {
        include(get_paged_template());
        exit;
    } else if ( file_exists(TEMPLATEPATH . "/index.php") ) {
        include(TEMPLATEPATH . "/index.php");
        exit;
    }
} else {
    // Process feeds and trackbacks even if not using themes.
    if ( is_feed() && empty($doing_rss) ) {
        include(ABSPATH . '/wp-feed.php');
        exit;
    } else if ( is_trackback() && empty($doing_trackback) ) {
        include(ABSPATH . '/wp-trackback.php');
        exit;
    }
}

endif;
?>