Proyectos de Subversion Moodle

<?php

// This file is part of Moodle - http://moodle.org/

//

// Moodle is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// Moodle is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**

 * setup.php - Sets up sessions, connects to databases and so on

 *

 * Normally this is only called by the main config.php file

 * Normally this file does not need to be edited.

 *

 * @package    core

 * @subpackage lib

 * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

/**

 * Holds the core settings that affect how Moodle works. Some of its fields

 * are set in config.php, and the rest are loaded from the config table.

 *

 * Some typical settings in the $CFG global:

 *  - $CFG->wwwroot  - Path to moodle index directory in url format.

 *  - $CFG->dataroot - Path to moodle data files directory on server's filesystem.

 *  - $CFG->dirroot  - Path to moodle's library folder on server's filesystem.

 *  - $CFG->libdir   - Path to moodle's library folder on server's filesystem.

 *  - $CFG->backuptempdir  - Path to moodle's backup temp file directory on server's filesystem.

 *  - $CFG->tempdir  - Path to moodle's temp file directory on server's filesystem.

 *  - $CFG->cachedir - Path to moodle's cache directory on server's filesystem (shared by cluster nodes).

 *  - $CFG->localcachedir - Path to moodle's local cache directory (not shared by cluster nodes).

 *  - $CFG->localrequestdir - Path to moodle's local temp request directory (not shared by cluster nodes).

 *

 * @global object $CFG

 * @name $CFG

 */

global $CFG; // this should be done much earlier in config.php before creating new $CFG instance

if (!isset($CFG)) {

    if (defined('PHPUNIT_TEST') and PHPUNIT_TEST) {

        echo('There is a missing "global $CFG;" at the beginning of the config.php file.'."\n");

        exit(1);

    } else {

        // this should never happen, maybe somebody is accessing this file directly...

        exit(1);

    }

}

// We can detect real dirroot path reliably since PHP 4.0.2,

// it can not be anything else, there is no point in having this in config.php

$CFG->dirroot = dirname(__DIR__);

// File permissions on created directories in the $CFG->dataroot

if (!isset($CFG->directorypermissions)) {

    $CFG->directorypermissions = 02777;      // Must be octal (that's why it's here)

}

if (!isset($CFG->filepermissions)) {

    $CFG->filepermissions = ($CFG->directorypermissions & 0666); // strip execute flags

}

// Better also set default umask because developers often forget to include directory

// permissions in mkdir() and chmod() after creating new files.

if (!isset($CFG->umaskpermissions)) {

    $CFG->umaskpermissions = (($CFG->directorypermissions & 0777) ^ 0777);

}

umask($CFG->umaskpermissions);

if (defined('BEHAT_SITE_RUNNING')) {

    // We already switched to behat test site previously.

} else if (!empty($CFG->behat_wwwroot) or !empty($CFG->behat_dataroot) or !empty($CFG->behat_prefix)) {

    // The behat is configured on this server, we need to find out if this is the behat test

    // site based on the URL used for access.

    require_once(__DIR__ . '/../lib/behat/lib.php');

    // Update config variables for parallel behat runs.

    behat_update_vars_for_process();

    // If behat is being installed for parallel run, then we modify params for parallel run only.

    if (behat_is_test_site() && !(defined('BEHAT_PARALLEL_UTIL') && empty($CFG->behatrunprocess))) {

        clearstatcache();

        // Checking the integrity of the provided $CFG->behat_* vars and the

        // selected wwwroot to prevent conflicts with production and phpunit environments.

        behat_check_config_vars();

        // Check that the directory does not contains other things.

        if (!file_exists("$CFG->behat_dataroot/behattestdir.txt")) {

            if ($dh = opendir($CFG->behat_dataroot)) {

                while (($file = readdir($dh)) !== false) {

                    if ($file === 'behat' or $file === '.' or $file === '..' or $file === '.DS_Store' or is_numeric($file)) {

                        continue;

                    }

                    behat_error(BEHAT_EXITCODE_CONFIG, "$CFG->behat_dataroot directory is not empty, ensure this is the " .

                        "directory where you want to install behat test dataroot");

                }

                closedir($dh);

                unset($dh);

                unset($file);

            }

            if (defined('BEHAT_UTIL')) {

                // Now we create dataroot directory structure for behat tests.

                testing_initdataroot($CFG->behat_dataroot, 'behat');

            } else {

                behat_error(BEHAT_EXITCODE_INSTALL);

            }

        }

        if (!defined('BEHAT_UTIL') and !defined('BEHAT_TEST')) {

            // Somebody tries to access test site directly, tell them if not enabled.

            $behatdir = preg_replace("#[/|\\\]" . BEHAT_PARALLEL_SITE_NAME . "\d{0,}$#", '', $CFG->behat_dataroot);

            if (!file_exists($behatdir . '/test_environment_enabled.txt')) {

                behat_error(BEHAT_EXITCODE_CONFIG, 'Behat is configured but not enabled on this test site.');

            }

        }

        // Constant used to inform that the behat test site is being used,

        // this includes all the processes executed by the behat CLI command like

        // the site reset, the steps executed by the browser drivers when simulating

        // a user session and a real session when browsing manually to $CFG->behat_wwwroot

        // like the browser driver does automatically.

        // Different from BEHAT_TEST as only this last one can perform CLI

        // actions like reset the site or use data generators.

        define('BEHAT_SITE_RUNNING', true);

        // Clean extra config.php settings.

        behat_clean_init_config();

        // Now we can begin switching $CFG->X for $CFG->behat_X.

        $CFG->wwwroot = $CFG->behat_wwwroot;

        $CFG->prefix = $CFG->behat_prefix;

        $CFG->dataroot = $CFG->behat_dataroot;

        // And we do the same with the optional ones.

        $allowedconfigoverride = ['dbname', 'dbuser', 'dbpass', 'dbhost'];

        foreach ($allowedconfigoverride as $config) {

            $behatconfig = 'behat_' . $config;

            if (!isset($CFG->$behatconfig)) {

                continue;

            }

            $CFG->$config = $CFG->$behatconfig;

        }

    }

}

// Set default warn runtime.

if (!isset($CFG->taskruntimewarn)) {

    $CFG->taskruntimewarn = 12 * 60 * 60;

}

// Set default error runtime.

if (!isset($CFG->taskruntimeerror)) {

    $CFG->taskruntimeerror = 24 * 60 * 60;

}

// Normalise dataroot - we do not want any symbolic links, trailing / or any other weirdness there

if (!isset($CFG->dataroot)) {

    if (isset($_SERVER['REMOTE_ADDR'])) {

        header($_SERVER['SERVER_PROTOCOL'] . ' 500 Internal Server Error ');

    }

    echo('Fatal error: $CFG->dataroot is not specified in config.php! Exiting.'."\n");

    exit(1);

}

$CFG->dataroot = realpath($CFG->dataroot);

if ($CFG->dataroot === false) {

    if (isset($_SERVER['REMOTE_ADDR'])) {

        header($_SERVER['SERVER_PROTOCOL'] . ' 500 Internal Server Error ');

    }

    echo('Fatal error: $CFG->dataroot is not configured properly, directory does not exist or is not accessible! Exiting.'."\n");

    exit(1);

} else if (!is_writable($CFG->dataroot)) {

    if (isset($_SERVER['REMOTE_ADDR'])) {

        header($_SERVER['SERVER_PROTOCOL'] . ' 500 Internal Server Error ');

    }

    echo('Fatal error: $CFG->dataroot is not writable, admin has to fix directory permissions! Exiting.'."\n");

    exit(1);

}

// wwwroot is mandatory

if (!isset($CFG->wwwroot) or $CFG->wwwroot === 'http://example.com/moodle') {

    if (isset($_SERVER['REMOTE_ADDR'])) {

        header($_SERVER['SERVER_PROTOCOL'] . ' 500 Internal Server Error ');

    }

    echo('Fatal error: $CFG->wwwroot is not configured! Exiting.'."\n");

    exit(1);

}

// The router configuration is mandatory.

$CFG->routerconfigured = !empty($CFG->routerconfigured);

// Make sure there is some database table prefix.

if (!isset($CFG->prefix)) {

    $CFG->prefix = '';

}

// Define admin directory

if (!isset($CFG->admin)) {   // Just in case it isn't defined in config.php

    $CFG->admin = 'admin';   // This is relative to the wwwroot and dirroot

}

// Set up some paths.

$CFG->libdir = $CFG->dirroot .'/lib';

// Allow overriding of tempdir but be backwards compatible

if (!isset($CFG->tempdir)) {

    $CFG->tempdir = $CFG->dataroot . DIRECTORY_SEPARATOR . "temp";

}

// Allow overriding of backuptempdir but be backwards compatible

if (!isset($CFG->backuptempdir)) {

    $CFG->backuptempdir = "$CFG->tempdir/backup";

}

// Allow overriding of cachedir but be backwards compatible

if (!isset($CFG->cachedir)) {

    $CFG->cachedir = "$CFG->dataroot/cache";

}

// Allow overriding of localcachedir.

if (!isset($CFG->localcachedir)) {

    $CFG->localcachedir = "$CFG->dataroot/localcache";

}

// Allow overriding of localrequestdir.

if (!isset($CFG->localrequestdir)) {

    $CFG->localrequestdir = sys_get_temp_dir() . '/requestdir';

}

// Location of all languages except core English pack.

if (!isset($CFG->langotherroot)) {

    $CFG->langotherroot = $CFG->dataroot.'/lang';

}

// Location of local lang pack customisations (dirs with _local suffix).

if (!isset($CFG->langlocalroot)) {

    $CFG->langlocalroot = $CFG->dataroot.'/lang';

}

// The current directory in PHP version 4.3.0 and above isn't necessarily the

// directory of the script when run from the command line. The require_once()

// would fail, so we'll have to chdir()

if (!isset($_SERVER['REMOTE_ADDR']) && isset($_SERVER['argv'][0])) {

    // do it only once - skip the second time when continuing after prevous abort

    if (!defined('ABORT_AFTER_CONFIG') and !defined('ABORT_AFTER_CONFIG_CANCEL')) {

        chdir(dirname($_SERVER['argv'][0]));

    }

}

// sometimes default PHP settings are borked on shared hosting servers, I wonder why they have to do that??

ini_set('precision', 14); // needed for upgrades and gradebook

ini_set('serialize_precision', -1); // Make float serialization consistent on all systems.

// Scripts may request no debug and error messages in output

// please note it must be defined before including the config.php script

// and in some cases you also need to set custom default exception handler

if (!defined('NO_DEBUG_DISPLAY')) {

    if (defined('AJAX_SCRIPT') and AJAX_SCRIPT) {

        // Moodle AJAX scripts are expected to return json data, any PHP notices or errors break it badly,

        // developers simply must learn to watch error log.

        define('NO_DEBUG_DISPLAY', true);

    } else {

        define('NO_DEBUG_DISPLAY', false);

    }

}

// Some scripts such as upgrade may want to prevent output buffering

if (!defined('NO_OUTPUT_BUFFERING')) {

    define('NO_OUTPUT_BUFFERING', false);

}

// PHPUnit tests need custom init

if (!defined('PHPUNIT_TEST')) {

    define('PHPUNIT_TEST', false);

}

// Performance tests needs to always display performance info, even in redirections;

// MDL_PERF_TEST is used in https://github.com/moodlehq/moodle-performance-comparison scripts.

if (!defined('MDL_PERF_TEST')) {

    define('MDL_PERF_TEST', false);

}

// Make sure all MDL_PERF* constants are always defined.

if (!defined('MDL_PERF')) {

    define('MDL_PERF', MDL_PERF_TEST);

}

if (!defined('MDL_PERFTOFOOT')) {

    define('MDL_PERFTOFOOT', MDL_PERF_TEST);

}

if (!defined('MDL_PERFTOLOG')) {

    define('MDL_PERFTOLOG', false);

}

if (!defined('MDL_PERFINC')) {

    define('MDL_PERFINC', false);

}

// Note that PHPUnit and Behat tests should pass with both MDL_PERF true and false.

// When set to true MUC (Moodle caching) will be disabled as much as possible.

// A special cache factory will be used to handle this situation and will use special "disabled" equivalents objects.

// This ensure we don't attempt to read or create the config file, don't use stores, don't provide persistence or

// storage of any kind.

if (!defined('CACHE_DISABLE_ALL')) {

    define('CACHE_DISABLE_ALL', false);

}

// When set to true MUC (Moodle caching) will not use any of the defined or default stores.

// The Cache API will continue to function however this will force the use of the dummy_cachestore so all requests

// will be interacting with a static property and will never go to the proper cache stores.

// Useful if you need to avoid the stores for one reason or another.

if (!defined('CACHE_DISABLE_STORES')) {

    define('CACHE_DISABLE_STORES', false);

}

// Servers should define a default timezone in php.ini, but if they don't then make sure no errors are shown.

date_default_timezone_set(@date_default_timezone_get());

// Detect CLI scripts - CLI scripts are executed from command line, do not have session and we do not want HTML in output

// In your new CLI scripts just add "define('CLI_SCRIPT', true);" before requiring config.php.

// Please note that one script can not be accessed from both CLI and web interface.

if (!defined('CLI_SCRIPT')) {

    define('CLI_SCRIPT', false);

}

if (defined('WEB_CRON_EMULATED_CLI')) {

    if (!isset($_SERVER['REMOTE_ADDR'])) {

        echo('Web cron can not be executed as CLI script any more, please use admin/cli/cron.php instead'."\n");

        exit(1);

    }

} else if (isset($_SERVER['REMOTE_ADDR'])) {

    if (CLI_SCRIPT) {

        echo('Command line scripts can not be executed from the web interface');

        exit(1);

    }

} else {

    if (!CLI_SCRIPT) {

        echo('Command line scripts must define CLI_SCRIPT before requiring config.php'."\n");

        exit(1);

    }

}

// All web service requests have WS_SERVER == true.

if (!defined('WS_SERVER')) {

    define('WS_SERVER', false);

}

// Detect CLI maintenance mode - this is useful when you need to mess with database, such as during upgrades

if (file_exists("$CFG->dataroot/climaintenance.html")) {

    if (!CLI_SCRIPT) {

        header($_SERVER['SERVER_PROTOCOL'] . ' 503 Moodle under maintenance');

        header('Status: 503 Moodle under maintenance');

        header('Retry-After: 300');

        header('Content-type: text/html; charset=utf-8');

        header('X-UA-Compatible: IE=edge');

        /// Headers to make it not cacheable and json

        header('Cache-Control: no-store, no-cache, must-revalidate');

        header('Cache-Control: post-check=0, pre-check=0', false);

        header('Pragma: no-cache');

        header('Expires: Mon, 20 Aug 1969 09:23:00 GMT');

        header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');

        header('Accept-Ranges: none');

        readfile("$CFG->dataroot/climaintenance.html");

        die;

    } else {

        if (!defined('CLI_MAINTENANCE')) {

            define('CLI_MAINTENANCE', true);

        }

    }

} else {

    if (!defined('CLI_MAINTENANCE')) {

        define('CLI_MAINTENANCE', false);

    }

}

// Some core parts of Moodle may make use of language features not available in older PHP versions.s

// When this happens as part of our core bootstrap, we can end up having confusing and spurious error

// messages which are hard to diagnose.

// This check allows us to insert a very basic check for the absolute minimum version of PHP for the

// Moodle core to be able to load the environment and error pages.

// It should only be updated in these circumstances, not with every PHP version.

if (version_compare(PHP_VERSION, '8.1.0') < 0) {

    $phpversion = PHP_VERSION;

    // Do NOT localise - lang strings would not work here and we CAN NOT move it to later place.

    echo "Moodle 4.4 or later requires at least PHP 8.1 (currently using version $phpversion).\n";

    echo "Some servers may have multiple PHP versions installed, are you using the correct executable?\n";

    exit(1);

}

// Detect ajax scripts - they are similar to CLI because we can not redirect, output html, etc.

if (!defined('AJAX_SCRIPT')) {

    define('AJAX_SCRIPT', false);

}

// Exact version of currently used yui2 and 3 library.

$CFG->yui2version = '2.9.0';

$CFG->yui3version = '3.18.1';

// Patching the upstream YUI release.

// If we need to patch a YUI modules between official YUI releases, the yuipatchlevel will need to be manually

// incremented here. The module will also need to be listed in the yuipatchedmodules.

// When upgrading to a subsequent version of YUI, these should be reset back to 0 and an empty array.

$CFG->yuipatchlevel = 0;

$CFG->yuipatchedmodules = array(

);

if (!empty($CFG->disableonclickaddoninstall)) {

    // This config.php flag has been merged into another one.

    $CFG->disableupdateautodeploy = true;

}

// Store settings from config.php in array in $CFG - we can use it later to detect problems and overrides.

if (!isset($CFG->config_php_settings)) {

    $CFG->config_php_settings = (array)$CFG;

    // Forced plugin settings override values from config_plugins table.

    unset($CFG->config_php_settings['forced_plugin_settings']);

    if (!isset($CFG->forced_plugin_settings)) {

        $CFG->forced_plugin_settings = array();

    }

}

if (isset($CFG->debug)) {

    $CFG->debug = (int)$CFG->debug;

} else {

    $CFG->debug = 0;

}

$CFG->debugdeveloper = (($CFG->debug & E_ALL) === E_ALL); // DEBUG_DEVELOPER is not available yet.

if (!defined('MOODLE_INTERNAL')) { // Necessary because cli installer has to define it earlier.

    /** Used by library scripts to check they are being called by Moodle. */

    define('MOODLE_INTERNAL', true);

}

// The core_component class can be used in any scripts, it does not need anything else.

require_once($CFG->libdir .'/classes/component.php');

/**

 * Database connection. Used for all access to the database.

 * @global moodle_database $DB

 * @name $DB

 */

global $DB;

/**

 * Moodle's wrapper round PHP's $_SESSION.

 *

 * @global object $SESSION

 * @name $SESSION

 */

global $SESSION;

/**

 * Holds the user table record for the current user. Will be the 'guest'

 * user record for people who are not logged in.

 *

 * $USER is stored in the session.

 *

 * Items found in the user record:

 *  - $USER->email - The user's email address.

 *  - $USER->id - The unique integer identified of this user in the 'user' table.

 *  - $USER->email - The user's email address.

 *  - $USER->firstname - The user's first name.

 *  - $USER->lastname - The user's last name.

 *  - $USER->username - The user's login username.

 *  - $USER->secret - The user's ?.

 *  - $USER->lang - The user's language choice.

 *

 * @global object $USER

 * @name $USER

 */

global $USER;

/**

 * Frontpage course record

 */

global $SITE;

/**

 * A central store of information about the current page we are

 * generating in response to the user's request.

 *

 * @global moodle_page $PAGE

 * @name $PAGE

 */

global $PAGE;

/**

 * The current course. An alias for $PAGE->course.

 * @global object $COURSE

 * @name $COURSE

 */

global $COURSE;

/**

 * $OUTPUT is an instance of core_renderer or one of its subclasses. Use

 * it to generate HTML for output.

 *

 * $OUTPUT is initialised the first time it is used. See {@link bootstrap_renderer}

 * for the magic that does that. After $OUTPUT has been initialised, any attempt

 * to change something that affects the current theme ($PAGE->course, logged in use,

 * httpsrequried ... will result in an exception.)

 *

 * Please note the $OUTPUT is replacing the old global $THEME object.

 *

 * @global object $OUTPUT

 * @name $OUTPUT

 */

global $OUTPUT;

/**

 * Full script path including all params, slash arguments, scheme and host.

 *

 * Note: Do NOT use for getting of current page URL or detection of https,

 * instead use $PAGE->url or is_https().

 *

 * @global string $FULLME

 * @name $FULLME

 */

global $FULLME;

/**

 * Script path including query string and slash arguments without host.

 * @global string $ME

 * @name $ME

 */

global $ME;

/**

 * $FULLME without slasharguments and query string.

 * @global string $FULLSCRIPT

 * @name $FULLSCRIPT

 */

global $FULLSCRIPT;

/**

 * Relative moodle script path '/course/view.php'

 * @global string $SCRIPT

 * @name $SCRIPT

 */

global $SCRIPT;

// The httpswwwroot has been deprecated, we keep it as an alias for backwards compatibility with plugins only.

$CFG->httpswwwroot = $CFG->wwwroot;

// We have to call this always before starting session because it discards headers!

if (NO_OUTPUT_BUFFERING) {

    // Try to disable all output buffering and purge all headers.

    $olddebug = error_reporting(0);

    // Disable compression, it would prevent closing of buffers.

    if ($outputcompression = ini_get('zlib.output_compression')) {

        switch(strtolower($outputcompression)) {

            case 'on':

            case '1':

                ini_set('zlib.output_compression', 'Off');

                break;

        }

    }

    // Try to flush everything all the time.

    ob_implicit_flush(true);

    // Close all buffers if possible and discard any existing output.

    // This can actually work around some whitespace problems in config.php.

    while (ob_get_level()) {

        if (!ob_end_clean()) {

            // Prevent infinite loop when buffer can not be closed.

            break;

        }

    }

    // Disable any other output handlers.

    ini_set('output_handler', '');

    error_reporting($olddebug);

    // Disable buffering in nginx.

    header('X-Accel-Buffering: no');

}

// Point pear include path to moodles lib/pear so that includes and requires will search there for files before anywhere else

// the problem is that we need specific version of quickforms and hacked excel files :-(.

ini_set('include_path', $CFG->libdir . '/pear' . PATH_SEPARATOR . ini_get('include_path'));

// Register our classloader.

\core\component::register_autoloader();

// Early profiling start, based exclusively on config.php $CFG settings

if (!empty($CFG->earlyprofilingenabled) && !defined('ABORT_AFTER_CONFIG_CANCEL')) {

    require_once($CFG->libdir . '/xhprof/xhprof_moodle.php');

    profiling_start();

}

// Special support for highly optimised scripts that do not need libraries and DB connection.

if (defined('ABORT_AFTER_CONFIG')) {

    if (!defined('ABORT_AFTER_CONFIG_CANCEL')) {

        // Hide debugging if not enabled in config.php - we do not want to disclose sensitive info.

        error_reporting($CFG->debug);

        if (NO_DEBUG_DISPLAY) {

            // Some parts of Moodle cannot display errors and debug at all.

            ini_set('display_errors', '0');

            ini_set('log_errors', '1');

        } else if (empty($CFG->debugdisplay)) {

            ini_set('display_errors', '0');

            ini_set('log_errors', '1');

        } else {

            ini_set('display_errors', '1');

        }

        require_once("$CFG->dirroot/lib/configonlylib.php");

        return;

    }

}

require_once($CFG->libdir .'/setuplib.php');        // Functions that MUST be loaded first.

// Load up standard libraries.

require_once($CFG->libdir .'/filterlib.php');       // Functions for filtering test as it is output.

require_once($CFG->libdir .'/ajax/ajaxlib.php');    // Functions for managing our use of JavaScript and YUI.

require_once($CFG->libdir .'/weblib.php');          // Functions relating to HTTP and content.

require_once($CFG->libdir .'/outputlib.php');       // Functions for generating output.

require_once($CFG->libdir .'/navigationlib.php');   // Class for generating Navigation structure.

require_once($CFG->libdir .'/dmllib.php');          // Database access.

require_once($CFG->libdir .'/datalib.php');         // Legacy lib with a big-mix of functions..

require_once($CFG->libdir .'/accesslib.php');       // Access control functions.

require_once($CFG->libdir .'/deprecatedlib.php');   // Deprecated functions included for backward compatibility.

require_once($CFG->libdir .'/moodlelib.php');       // Other general-purpose functions.

require_once($CFG->libdir .'/enrollib.php');        // Enrolment related functions.

require_once($CFG->libdir .'/pagelib.php');         // Library that defines the moodle_page class, used for $PAGE.

require_once($CFG->libdir .'/blocklib.php');        // Library for controlling blocks.

require_once($CFG->libdir .'/grouplib.php');        // Groups functions.

require_once($CFG->libdir .'/sessionlib.php');      // All session and cookie related stuff.

require_once($CFG->libdir .'/editorlib.php');       // All text editor related functions and classes.

require_once($CFG->libdir .'/messagelib.php');      // Messagelib functions.

require_once($CFG->libdir .'/modinfolib.php');      // Cached information on course-module instances.

// Increase memory limits if possible.

raise_memory_limit(MEMORY_STANDARD);

// Time to start counting

init_performance_info();

// Put $OUTPUT in place, so errors can be displayed.

$OUTPUT = new bootstrap_renderer();

// Set handler for uncaught exceptions - equivalent to throw new \moodle_exception() call.

if (!PHPUNIT_TEST or PHPUNIT_UTIL) {

    set_exception_handler('default_exception_handler');

    set_error_handler('default_error_handler', E_ALL);

}

// Acceptance tests needs special output to capture the errors,

// but not necessary for behat CLI command and init script.

if (defined('BEHAT_SITE_RUNNING') && !defined('BEHAT_TEST') && !defined('BEHAT_UTIL')) {

    require_once(__DIR__ . '/behat/lib.php');

    set_error_handler('behat_error_handler', E_ALL);

}

if (defined('WS_SERVER') && WS_SERVER) {

    require_once($CFG->dirroot . '/webservice/lib.php');

    set_exception_handler('early_ws_exception_handler');

}

// If there are any errors in the standard libraries we want to know!

error_reporting(E_ALL);

// Just say no to link prefetching (Moz prefetching, Google Web Accelerator, others)

// http://www.google.com/webmasters/faq.html#prefetchblock

if (!empty($_SERVER['HTTP_X_moz']) && $_SERVER['HTTP_X_moz'] === 'prefetch'){

    header($_SERVER['SERVER_PROTOCOL'] . ' 404 Prefetch Forbidden');

    echo('Prefetch request forbidden.');

    exit(1);

}

// Remember the default PHP timezone, we will need it later.

core_date::store_default_php_timezone();

// make sure PHP is not severly misconfigured

setup_validate_php_configuration();

// Connect to the database

setup_DB();

if (PHPUNIT_TEST and !PHPUNIT_UTIL) {

    // Make sure tests do not run in parallel.

    $suffix = '';

    if (phpunit_util::is_in_isolated_process()) {

        $suffix = '.isolated';

    }

    test_lock::acquire('phpunit', $suffix);

    $dbhash = null;

    try {

        if ($dbhash = $DB->get_field('config', 'value', array('name'=>'phpunittest'))) {

            // reset DB tables

            phpunit_util::reset_database();

        }

    } catch (Exception $e) {

        if ($dbhash) {

            // we ned to reinit if reset fails

            $DB->set_field('config', 'value', 'na', array('name'=>'phpunittest'));

        }

    }

    unset($dbhash);

}

// Load any immutable bootstrap config from local cache.

$bootstraplocalfile = $CFG->localcachedir . '/bootstrap.php';

$bootstrapsharedfile = $CFG->cachedir . '/bootstrap.php';

if (!is_readable($bootstraplocalfile) && is_readable($bootstrapsharedfile)) {

    // If we don't have a local cache but do have a shared cache then clone it,

    // for example when scaling up new front ends.

    make_localcache_directory('', true);

    copy($bootstrapsharedfile, $bootstraplocalfile);

}

if (is_readable($bootstraplocalfile)) {

    try {

        require_once($bootstraplocalfile);

        // Verify the file is not stale.

        if (!isset($CFG->bootstraphash) || $CFG->bootstraphash !== hash_local_config_cache()) {

            // Something has changed, the bootstrap.php file is stale.

            unset($CFG->siteidentifier);

            @unlink($bootstraplocalfile);

            @unlink($bootstrapsharedfile);

        }

    } catch (Throwable $e) {

        // If it is corrupted then attempt to delete it and it will be rebuilt.

        @unlink($bootstraplocalfile);

        @unlink($bootstrapsharedfile);

    }

}

// Load up any configuration from the config table or MUC cache.

if (PHPUNIT_TEST) {

    phpunit_util::initialise_cfg();

} else {

    initialise_cfg();

}

if (isset($CFG->debug)) {

    $CFG->debug = (int)$CFG->debug;

    error_reporting($CFG->debug);

}  else {

    $CFG->debug = 0;

}

$CFG->debugdeveloper = (($CFG->debug & DEBUG_DEVELOPER) === DEBUG_DEVELOPER);

// Set a default value for whether to show exceptions in a pretty format.

if (!property_exists($CFG, 'debug_developer_use_pretty_exceptions')) {

    $CFG->debug_developer_use_pretty_exceptions = true;

}

// Find out if PHP configured to display warnings,

// this is a security problem because some moodle scripts may

// disclose sensitive information.

if (ini_get_bool('display_errors')) {

    define('WARN_DISPLAY_ERRORS_ENABLED', true);

}

// If we want to display Moodle errors, then try and set PHP errors to match.

if (!isset($CFG->debugdisplay)) {

    // Keep it "as is" during installation.

} else if (NO_DEBUG_DISPLAY) {

    // Some parts of Moodle cannot display errors and debug at all.

    ini_set('display_errors', '0');

    ini_set('log_errors', '1');

    ini_set('zend.exception_ignore_args', '1');

} else if (empty($CFG->debugdisplay)) {

    ini_set('display_errors', '0');

    ini_set('log_errors', '1');

    ini_set('zend.exception_ignore_args', '1');

} else {

    // This is very problematic in XHTML strict mode!

    ini_set('display_errors', '1');

}

// Register our shutdown manager, do NOT use register_shutdown_function().

core_shutdown_manager::initialize();

// Verify upgrade is not running unless we are in a script that needs to execute in any case

if (!defined('NO_UPGRADE_CHECK') and isset($CFG->upgraderunning)) {

    if ($CFG->upgraderunning < time()) {

        unset_config('upgraderunning');

    } else {

        throw new \moodle_exception('upgraderunning');

    }

}

// enable circular reference collector in PHP 5.3,

// it helps a lot when using large complex OOP structures such as in amos or gradebook

if (function_exists('gc_enable')) {

    gc_enable();

}

// detect unsupported upgrade jump as soon as possible - do not change anything, do not use system functions

if (!empty($CFG->version) and $CFG->version < 2007101509) {

    throw new \moodle_exception('upgraderequires19', 'error');

    die;

}

// Calculate and set $CFG->ostype to be used everywhere. Possible values are:

// - WINDOWS: for any Windows flavour.

// - UNIX: for the rest

// Also, $CFG->os can continue being used if more specialization is required

if (stristr(PHP_OS, 'win') && !stristr(PHP_OS, 'darwin')) {

    $CFG->ostype = 'WINDOWS';

} else {

    $CFG->ostype = 'UNIX';

}

$CFG->os = PHP_OS;

// Configure ampersands in URLs

ini_set('arg_separator.output', '&');

// Work around for a PHP bug   see MDL-11237

ini_set('pcre.backtrack_limit', 20971520);  // 20 MB

// Set PHP default timezone to server timezone.

core_date::set_default_server_timezone();

// Location of standard files

$CFG->wordlist = $CFG->libdir .'/wordlist.txt';

$CFG->moddata  = 'moddata';

// neutralise nasty chars in PHP_SELF

if (isset($_SERVER['PHP_SELF'])) {

    $phppos = strpos($_SERVER['PHP_SELF'], '.php');

    if ($phppos !== false) {

        $_SERVER['PHP_SELF'] = substr($_SERVER['PHP_SELF'], 0, $phppos+4);

    }

    unset($phppos);

}

// initialise ME's - this must be done BEFORE starting of session!

initialise_fullme();

// SYSCONTEXTID is cached in local cache to eliminate 1 query per page.

if (!defined('SYSCONTEXTID')) {

    context_system::instance();

}

// Defining the site - aka frontpage course

try {

    $SITE = get_site();

} catch (moodle_exception $e) {

    $SITE = null;

    if (empty($CFG->version)) {

        $SITE = new stdClass();

        $SITE->id = 1;

        $SITE->shortname = null;

    } else {

        throw $e;

    }

}

// And the 'default' course - this will usually get reset later in require_login() etc.

$COURSE = clone($SITE);

// Id of the frontpage course.

define('SITEID', $SITE->id);

// init session prevention flag - this is defined on pages that do not want session

if (CLI_SCRIPT) {

    // no sessions in CLI scripts possible

    define('NO_MOODLE_COOKIES', true);

} else if (WS_SERVER) {

    // No sessions possible in web services.

    define('NO_MOODLE_COOKIES', true);

} else if (!defined('NO_MOODLE_COOKIES')) {

    if (empty($CFG->version) or $CFG->version < 2009011900) {

        // no session before sessions table gets created

        define('NO_MOODLE_COOKIES', true);

    } else if (CLI_SCRIPT) {

        // CLI scripts can not have session

        define('NO_MOODLE_COOKIES', true);

    } else {

        define('NO_MOODLE_COOKIES', false);

    }

}

// Start session and prepare global $SESSION, $USER.

if (empty($CFG->sessiontimeout)) {

    $CFG->sessiontimeout = 8 * 60 * 60;

}

// Set sessiontimeoutwarning 20 minutes.

if (empty($CFG->sessiontimeoutwarning)) {

    $CFG->sessiontimeoutwarning = 20 * 60;

}

// Allow plugins to callback just before the session is started.

$pluginswithfunction = get_plugins_with_function('before_session_start', 'lib.php');

foreach ($pluginswithfunction as $plugins) {

    foreach ($plugins as $function) {

        try {

            $function();

        } catch (Throwable $e) {

            debugging("Exception calling '$function'", DEBUG_DEVELOPER, $e->getTrace());

        }

    }

}

\core\session\manager::start();

// Prevent ignoresesskey hack from getting carried over to a next page.

unset($USER->ignoresesskey);

if (!empty($CFG->proxylogunsafe) || !empty($CFG->proxyfixunsafe)) {

    if (!empty($CFG->proxyfixunsafe)) {

        require_once($CFG->libdir.'/filelib.php');

        $proxyurl = get_moodle_proxy_url();

        // This fixes stream handlers inside php.

        $defaults = stream_context_set_default([

            'http' => [

                'user_agent' => \core_useragent::get_moodlebot_useragent(),

                'proxy' => $proxyurl

            ],

        ]);

        // Attempt to tell other web clients to use the proxy too. This only

        // works for clients written in php in the same process, it will not

        // work for with requests done in another process from an exec call.

        putenv('http_proxy=' . $proxyurl);

        putenv('https_proxy=' . $proxyurl);

        putenv('HTTPS_PROXY=' . $proxyurl);

    } else {

        $defaults = stream_context_get_default();

    }

    if (!empty($CFG->proxylogunsafe)) {

        stream_context_set_params($defaults, ['notification' => 'proxy_log_callback']);

    }

}

// Set default content type and encoding, developers are still required to use

// echo $OUTPUT->header() everywhere, anything that gets set later should override these headers.

// This is intended to mitigate some security problems.

if (AJAX_SCRIPT) {

    if (!core_useragent::supports_json_contenttype()) {

        // Some bloody old IE.

        @header('Content-type: text/plain; charset=utf-8');

        @header('X-Content-Type-Options: nosniff');

    } else if (!empty($_FILES)) {

        // Some ajax code may have problems with json and file uploads.

        @header('Content-type: text/plain; charset=utf-8');

    } else {

        @header('Content-type: application/json; charset=utf-8');

    }

} else if (!CLI_SCRIPT) {

    @header('Content-type: text/html; charset=utf-8');

}

// Initialise some variables that are supposed to be set in config.php only.

if (!isset($CFG->filelifetime)) {

    $CFG->filelifetime = 60*60*6;

}

// Late profiling, only happening if early one wasn't started

if (!empty($CFG->profilingenabled)) {

    require_once($CFG->libdir . '/xhprof/xhprof_moodle.php');

    profiling_start();

}

// Hack to get around max_input_vars restrictions,

// we need to do this after session init to have some basic DDoS protection.

workaround_max_input_vars();

// Process theme change in the URL.

if (!empty($CFG->allowthemechangeonurl) and !empty($_GET['theme'])) {

    // we have to use _GET directly because we do not want this to interfere with _POST

    $urlthemename = optional_param('theme', '', PARAM_PLUGIN);

    try {

        $themeconfig = theme_config::load($urlthemename);

        // Makes sure the theme can be loaded without errors.

        if ($themeconfig->name === $urlthemename) {

            $SESSION->theme = $urlthemename;

        } else {

            unset($SESSION->theme);

        }

        unset($themeconfig);

        unset($urlthemename);

    } catch (Exception $e) {

        debugging('Failed to set the theme from the URL.', DEBUG_DEVELOPER, $e->getTrace());

    }

}

unset($urlthemename);

// Ensure a valid theme is set.

if (!isset($CFG->theme)) {

    $CFG->theme = 'boost';

}

// Set language/locale of printed times.  If user has chosen a language that

// that is different from the site language, then use the locale specified