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The syntax highlighted source is automatically generated by PHP from the plaintext script. If you're interested in what's behind the several functions we used, you can always take a look at the source of the following files:

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Source of: /error.php

<?php

// $Id: error.php 289837 2009-10-21 21:35:50Z bjori $

/*

 This script handles all 401, 403 and 404 error redirects,
 and some directory requests (like /images). Uses the
 preferred language setting and the REQUEST_URI to guess what
 page should be displayed. In case there is no page that can
 be displayed, the user is redirected to a search page.

*/

// Ensure that our environment is set up
include_once $_SERVER['DOCUMENT_ROOT'] . '/include/prepend.inc';
include_once $_SERVER['DOCUMENT_ROOT'] . '/include/loadavg.inc';
include_once $_SERVER['DOCUMENT_ROOT'] . '/include/errors.inc';

// Get URI for this request, strip leading slash
// See langchooser.inc for more info on STRIPPED_URI
$URI = substr($_SERVER['STRIPPED_URI'], 1);

// ============================================================================
// Mozilla Search Sidebar plugin resource file handling (need to be mirror
// dependent, so the search results will show up in the sidebar)
if ($URI == 'phpnetsearch.src') {
    status_header(200);
    include_once $_SERVER['DOCUMENT_ROOT'] . '/include/mozsearch.inc';
    exit;
}
// FIXME: Nuke the old firefox search plugin
if ($URI == 'phpnetimprovedsearch.src') {
    status_header(200);
    include_once $_SERVER['DOCUMENT_ROOT'] . '/include/mozopensearch.inc';
    exit;
}

// ============================================================================
// BC: handle bugs.php moved completely to bugs.php.net
if (preg_match("!^bugs.php\\?(.+)$!", $URI, $array)) {
    mirror_redirect("http://bugs.php.net/?$array[1]");
}

// ============================================================================
// FC: handle advisories
if (preg_match("!^security/advisories/PHPSA-(\\d+)\\.php$!", $URI, $array)) {
    status_header(200);
    $_GET["id"] = $array[1];
    include_once $_SERVER['DOCUMENT_ROOT'] . '/security/index.php';
    exit;
}

// ============================================================================
// Omit query string from URL and urldecode special chars
$URI = urldecode(preg_replace("!(\\?.*$)!", "", $URI));

// ============================================================================
// Perform a redirect for manual figures, other images display a 404 automatically
if (preg_match("!^manual/(\\w+)/(print|printwn)/figures/(.+)$!", $URI, $parts)) {
    mirror_redirect("/manual/$parts[1]/figures/$parts[3]");
} elseif (preg_match("!\\.(pdf|gif|jpg|png)$!i", $URI)) {
    error_404();
}

// ============================================================================
// BC: handle .php3 files that were renamed to .php
if (preg_match("!(.*\\.php)3$!", $URI, $array)) {
    mirror_redirect("/$array[1]");
}

// ============================================================================
// BC: handle moving english manual down into its own directory (also supports
//     default language manual accessibilty on mirror sites through /manual/filename)
if (preg_match("!^manual(/[^/]*)$!", $URI, $array)) {
    mirror_redirect("/manual/$LANG$array[1]");
} elseif (preg_match("!^manual/html/([^/]+)$!", $URI, $array)) {
    $array[1] = preg_replace("!.html$!", ".php", $array[1]);
    mirror_redirect("/manual/$LANG/$array[1]");
}

// ============================================================================
// BC: News archive moved to subfolder
if (preg_match("!^news-(\\d+)(\\.|$)!", $URI, $array)) {
    mirror_redirect("/archive/$array[1].php");
}

// ============================================================================
// BC: Release files moved to subfolder
if (preg_match("!^release_([^\\.]+)(\\.php$|$)!", $URI, $array)) {
    mirror_redirect("/releases/$array[1].php");
}

// ============================================================================
// BC: handle documentation howto moved to the doc.php.net server
// (redirect to index page)
if (preg_match("!^manual/howto/!", $URI, $array)) {
    mirror_redirect("http://doc.php.net/php/dochowto/");
}

// ============================================================================
// BC: Printer friendly manual page handling was separate previously, but we
// only need to redirect the old URLs now. Our pages are now printer friendly
// by design.
if (preg_match("!^manual/(\\w+)/(print|printwn|html)((/.+)|$)!", $URI, $array)) {
    $array[3] = preg_replace("!.html$!", ".php", $array[3]);
    mirror_redirect("/manual/$array[1]$array[3]");
}

// ============================================================================
// The trailing slash only causes problems from now on
$URI = preg_replace('!/+$!', '', $URI);

// ============================================================================
// Some nice URLs for getting something for download
if (preg_match("!^get/([^/]+)$!", $URI, $what)) {
    switch ($what[1]) {
        case "php"           : $URI = "downloads"; break;
        case "docs"          : // intentional
        case "documentation" : $URI = "download-docs"; break;
        case "dochowto"      : // intentional
        case "phpdochowto"   : $URI = "getdochowto"; break;
    }
}


// ============================================================================
// Nice URLs for download files, so wget works completely well with download links
if (preg_match("!^get/([^/]+)/from/([^/]+)(/mirror)?$!", $URI, $dlinfo)) {
   
    $df = $dlinfo[1];
    if(strpos($df, "5-LATEST") !== false) {
        include_once $_SERVER['DOCUMENT_ROOT'] . "/include/version.inc";
        $df = str_replace("5-LATEST", $PHP_5_VERSION, $df);
    } elseif(strpos($df, "4-LATEST") !== false) {
        include_once $_SERVER['DOCUMENT_ROOT'] . "/include/version.inc";
        $df = str_replace("4-LATEST", $PHP_4_VERSION, $df);
    }
   
    // Mirror selection page
    if ($dlinfo[2] == "a") {
        status_header(200);
        include_once $_SERVER['DOCUMENT_ROOT'] . "/include/get-download.inc";
        exit;
    }
   
    // The same mirror is selected
    if ($dlinfo[2] == "this") { $mr = $MYSITE; }
   
    // Some other mirror is selected
    else { $mr = "http://{$dlinfo[2]}/"; }
   
    // Check if that mirror really exists if not, bail out
    if(!isset($MIRRORS[$mr])) {
        error_nomirror($mr);
        exit;
    }
    // Start the download process
    status_header(200);
    include $_SERVER['DOCUMENT_ROOT'] . "/include/do-download.inc";
    download_file($mr, $df);
    exit;
}

// The rest rendering
if (strpos($URI, "reST/") === 0) {
    $_GET["rel_path"] = substr($URI, 5);
    include $_SERVER['DOCUMENT_ROOT'] ."/reST/index.php";
    exit;
}

// php.net/42 --> likely a bug number
if (is_numeric($URI)) {
    mirror_redirect("http://bugs.php.net/bug.php?id=$URI");
}
 
// Work with lowercased URI from now
$URI = strtolower($URI);

// Redirection hack, see error.inc for detailed description
// These expect -foo not _foo
$term = str_replace('_', '-', $URI);

if ($path = is_known_ini($term)) {
    status_header(301);
    mirror_redirect("/manual/$LANG/$path");
    exit;
}
if ($path = is_known_variable($term)) {
    status_header(301);
    mirror_redirect("/manual/$LANG/$path");
    exit;
}
if ($path = is_known_term($term)) {
    status_header(301);
    mirror_redirect("/manual/$LANG/$path");
    exit;
}

// ============================================================================
// Major manual page modifications (need to handle shortcuts and pages in all languages)
// Used permanent HTTP redirects, so search engines will be able to pick up the correct
// new URLs for these pages.
$manual_page_moves = array(
    // entry point changed
    'installation'               => 'install',
   
    // was splitted among platforms (don't know where to redirect)
    'install.apache'             => 'install',
    'install.apache2'            => 'install',
    'install.netscape-enterprise'=> 'install',
    'install.otherhttpd'         => 'install',
   
    // moved to platform sections
    'install.caudium'            => 'install.unix.caudium',
    'install.commandline'        => 'install.unix.commandline',
    'install.fhttpd'             => 'install.unix.fhttpd',
    'install.hpux'               => 'install.unix.hpux',
    'install.iis'                => 'install.windows.iis',
    'install.linux'              => 'install.unix',
    'install.omnihttpd'          => 'install.windows.omnihttpd',
    'install.openbsd'            => 'install.unix.openbsd',
    'install.sambar'             => 'install.windows.sambar',
    'install.solaris'            => 'install.unix.solaris',
    'install.xitami'             => 'install.windows.xitami',

    // Internals docs where moved
    'zend'                       => 'internals2.ze1.zendapi',
    'zend-api'                   => 'internals2.ze1.zendapi',
    'internals.pdo'              => 'internals2.pdo',
    'phpdevel'                   => 'internals2.ze1.php3devel',
    'tsrm'                       => 'internals2.ze1.tsrm',

    // Replaced extensions
    'aspell'                     => 'pspell',

    // Refactored
    'regexp.reference'           => 'regexp.introduction',
);

if (isset($manual_page_moves[$URI])) {
    status_header(301);
    mirror_redirect("/" . $manual_page_moves[$URI]);
} elseif (preg_match("!^manual/([^/]+)/([^/]+).php$!", $URI, $match) &&
          isset($manual_page_moves[$match[2]])) {
    status_header(301);
    mirror_redirect("/manual/$match[1]/" . $manual_page_moves[$match[2]] . ".php");
}

// ============================================================================
// Define shortcuts for PHP files, manual pages and external redirects
$uri_aliases = array (

    # PHP page shortcuts
    "download"      => "downloads",
    "getphp"        => "downloads",
    "getdocs"       => "download-docs",
    "documentation" => "docs",
    "mailinglists"  => "mailing-lists",
    "mailinglist"   => "mailing-lists",
    "changelog"     => "ChangeLog-5",
    "gethelp"       => "support",
    "help"          => "support",
    "unsubscribe"   => "unsub",
    "subscribe"     => "mailing-lists",
    "logos"         => "download-logos",

    # manual shortcuts
    "intro"        => "introduction",
    "whatis"       => "introduction",
    "whatisphp"    => "introduction",
    "what_is_php"  => "introduction",

    "windows"      => "install.windows",
    "win32"        => "install.windows",

    "globals"          => "language.variables.predefined",
    "register_globals" => "security.globals",
    "registerglobals"  => "security.globals",
    "manual/en/security.registerglobals.php" => "security.globals", // fix for 4.3.8 configure
    "magic_quotes"     => "security.magicquotes",
    "magicquotes"      => "security.magicquotes",
    "gd"               => "image",
    'streams'          => 'book.stream',

    "callback"     => "language.pseudo-types",
    "number"       => "language.pseudo-types",
    "mixed"        => "language.pseudo-types",
    "bool"         => "language.types.boolean",
    "boolean"      => "language.types.boolean",
    "int"          => "language.types.integer",
    "integer"      => "language.types.integer",
    "float"        => "language.types.float",
    "string"       => "language.types.string",
    "heredoc"      => "language.types.string",
    "<<<"          => "language.types.string",
    "object"       => "language.types.object",
    "null"         => "language.types.null",

    "htaccess"     => "configuration.changes",
    "php_value"    => "configuration.changes",

    "ternary"      => "language.operators.comparison",
    "instanceof"   => "language.operators.type",
    "if"           => "language.control-structures",
    "static"       => "language.variables.scope",
    "global"       => "language.variables.scope",
    "@"            => "language.operators.errorcontrol",
    "&"            => "language.references",
   
    "tut"          => "tutorial",
    "tut.php"      => "tutorial", // BC

    "faq.php"      => "faq",      // BC
    "bugs.php"     => "bugs",     // BC
    "bugstats.php" => "bugstats", // BC
    "docs-echm.php"=> "download-docs", // BC

    "odbc"         => "uodbc", // BC
    "oracle"       => "oci8",
    "_"            => "function.gettext",
    "cli"          => "features.commandline",

    "oop4"         => "language.oop",
    "oop"          => "language.oop5",

    "class"        => "language.oop5.basic",
    "new"          => "language.oop5.basic",
    "extends"      => "language.oop5.basic",
    "clone"        => "language.oop5.cloning",
    "construct"    => "language.oop5.decon",
    "destruct"     => "language.oop5.decon",
    "public"       => "language.oop5.visibility",
    "private"      => "language.oop5.visibility",
    "protected"    => "language.oop5.visibility",
    "abstract"     => "language.oop5.abstract",
    "interface"    => "language.oop5.interfaces",
    "interfaces"   => "language.oop5.interfaces",
    "autoload"     => "language.oop5.autoload",
    "__autoload"   => "language.oop5.autoload",
    "language.oop5.reflection" => "book.reflection", // BC
    "::"           => "language.oop5.paamayim-nekudotayim",

    "__construct"  => "language.oop5.decon",
    "__destruct"   => "language.oop5.decon",
    "__call"       => "language.oop5.overloading",
    "__callstatic" => "language.oop5.overloading",
    "__get"        => "language.oop5.overloading",
    "__set"        => "language.oop5.overloading",
    "__isset"      => "language.oop5.overloading",
    "__unset"      => "language.oop5.overloading",
    "__sleep"      => "language.oop5.magic",
    "__wakeup"     => "language.oop5.magic",
    "__tostring"   => "language.oop5.magic",
    "__set_state"  => "language.oop5.magic",
    "__clone"      => "language.oop5.cloning",

    "throw"        => "language.exceptions",
    "try"          => "language.exceptions",
    "catch"        => "language.exceptions",
    "lsb"          => "language.oop5.late-static-bindings",
    "namespace"    => "language.namespaces",
    "use"          => "language.namespaces.using",
    "iterator"     => "language.oop5.iterations",
   
    "factory"      => "language.oop5.patterns",
    "singleton"    => "language.oop5.patterns",
   
    "news.php"                     => "archive/index", // BC
    "readme.mirror"                => "mirroring", // BC
   
    "php5"                         => "language.oop5",
    "zend_changes.txt"             => "language.oop5", // BC
    "zend2_example.phps"           => "language.oop5", // BC
    "zend_changes_php_5_0_0b2.txt" => "language.oop5", // BC
    "zend-engine-2"                => "language.oop5", // BC
    "zend-engine-2.php"            => "language.oop5", // BC
   
    "news_php_5_0_0b2.txt"         => "ChangeLog-5", // BC
    "news_php_5_0_0b3.txt"         => "ChangeLog-5", // BC
   
    "manual/about-notes.php" => "manual/add-note",   // BC
    "software/index.php"     => "software",          // BC
    "releases.php"           => "releases/index",    // BC

    "update_5_2.txt"         => "migration52",      // BC
    "readme_upgrade_51.php"  => "migration51",      // BC
    "internals"              => "internals2",        // BC
   
    # external shortcut aliases ;)
    "dochowto"     => "phpdochowto",
    "projects.php" => "projects", // BC
   
    # CVS -> SVN
    "anoncvs.php"   => "svn",
    "cvs-php.php"   => "svn-php",
);

$external_redirects = array(
    "php4news"    => "http://svn.php.net/viewvc/php/php-src/branches/PHP_4_4/NEWS?view=markup",
    "php5news"    => "http://svn.php.net/viewvc/php/php-src/branches/PHP_5_3/NEWS?view=markup",
    "php6news"    => "http://svn.php.net/viewvc/php/php-src/trunk/NEWS?view=markup",
    "projects"    => "http://freshmeat.net/browse/183/",
    "pear"        => "http://pear.php.net/",
    "bugs"        => "http://bugs.php.net/",
    "bugstats"    => "http://bugs.php.net/bugstats.php",
    "phpdochowto" => "http://doc.php.net/php/dochowto/",
    "getdochowto" => "http://doc.php.net/php/dochowto/howto.html.tar.gz",
    "rev"         => "http://doc.php.net/php/$LANG/revcheck.php",
    "functions.js.txt" => "http://svn.php.net/phpdoc/doc-base/trunk/scripts/quickref",
    "release/5_3_0.php" => "/releases/5_3_0.php", // PHP 5.3.0 release announcement had a typo
    "ideas.php"   => "http://wiki.php.net/ideas", // BC
);

// ============================================================================
// "Rewrite" the URL, if it was a shortcut

if (isset($uri_aliases[$URI])) {
    $URI = $uri_aliases[$URI];
}

// ============================================================================
// Redirect if the entered URI was a PHP page name (except some pages,
// which we display in the mirror's language or the explicitly specified
// language [see below])
if (!in_array($URI, array('mirror-info', 'error')) &&
    file_exists($_SERVER['DOCUMENT_ROOT'] . "/$URI.php")) {
    mirror_redirect("/$URI.php");
}

// ============================================================================
// Execute external redirect if a rule exists for the URI
if (isset($external_redirects[$URI])) {
    mirror_redirect($external_redirects[$URI]);
}

// Temporary hack for mirror-info, until all the pages
// will be capable of being included from anywhere
if ($URI=='mirror-info') {
    status_header(200);
    include_once $_SERVER['DOCUMENT_ROOT'] . "/$URI.php";
    exit;
}

// ============================================================================
// Try to find the page using the preferred language as a manual page
include_once $_SERVER['DOCUMENT_ROOT'] . "/include/manual-lookup.inc";
$try = find_manual_page($LANG, $URI);
if ($try) {
    status_header(200);
    include_once $_SERVER['DOCUMENT_ROOT'] . $try;
    exit;
}
// BC. The class methods are now classname.methodname
if (preg_match("!^manual/(.+)/function\.(.+)-(.+).php$!", $URI, $array)) {
    $try = find_manual_page($array[1], $array[2]. "." .$array[3]);
    if ($try) {
        status_header(301);
        mirror_redirect($try);
        exit;
    }
}


// ============================================================================
// 404 page for manual pages (eg. not built language)
if (strpos($URI, "manual/") === 0) {
    error_404_manual();
}

// ============================================================================
// If no match was found till this point, the last action is to start a
// search with the URI the user typed in
$fallback = (myphpnet_urlsearch() === MYPHPNET_URL_MANUAL ? "manual" : "quickref");
mirror_redirect(
    '/search.php?show=' . $fallback . '&lang=' . urlencode($LANG) .
    '&pattern=' . urlencode(substr($_SERVER['REQUEST_URI'], 1))
);
/*
 * vim:et
 */
?>
 
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