function DrupalKernel::bootEnvironment

Setup a consistent PHP environment.

This method sets PHP environment options we want to be sure are set correctly for security or just saneness.

Parameters

string $app_root: (optional) The path to the application root as a string. If not supplied, the application root will be computed.

File

core/lib/Drupal/Core/DrupalKernel.php, line 1048

Class

DrupalKernel

The DrupalKernel class is the core of Drupal itself.

Namespace

Code

public static function bootEnvironment($app_root = NULL) {
    if (static::$isEnvironmentInitialized) {
        return;
    }
    // Determine the application root if it's not supplied.
    if ($app_root === NULL) {
        $app_root = static::guessApplicationRoot();
    }
    // Enforce E_STRICT, but allow users to set levels not part of E_STRICT.
    error_reporting(E_STRICT | E_ALL);
    // Override PHP settings required for Drupal to work properly.
    // sites/default/default.settings.php contains more runtime settings.
    // The .htaccess file contains settings that cannot be changed at runtime.
    if (PHP_SAPI !== 'cli') {
        // Use session cookies, not transparent sessions that puts the session id
        // in the query string.
        ini_set('session.use_cookies', '1');
        ini_set('session.use_only_cookies', '1');
        ini_set('session.use_trans_sid', '0');
        // Don't send HTTP headers using PHP's session handler.
        // Send an empty string to disable the cache limiter.
        ini_set('session.cache_limiter', '');
        // Use httponly session cookies.
        ini_set('session.cookie_httponly', '1');
    }
    // Set sane locale settings, to ensure consistent string, dates, times and
    // numbers handling.
    setlocale(LC_ALL, 'C.UTF-8', 'C');
    // Set appropriate configuration for multi-byte strings.
    mb_internal_encoding('utf-8');
    mb_language('uni');
    // Indicate that code is operating in a test child site.
    if (!defined('DRUPAL_TEST_IN_CHILD_SITE')) {
        if ($test_prefix = drupal_valid_test_ua()) {
            $test_db = new TestDatabase($test_prefix);
            // Only code that interfaces directly with tests should rely on this
            // constant; e.g., the error/exception handler conditionally adds further
            // error information into HTTP response headers that are consumed by
            // the internal browser.
            define('DRUPAL_TEST_IN_CHILD_SITE', TRUE);
            // Log fatal errors to the test site directory.
            ini_set('log_errors', 1);
            ini_set('error_log', $app_root . '/' . $test_db->getTestSitePath() . '/error.log');
            // Ensure that a rewritten settings.php is used if opcache is on.
            ini_set('opcache.validate_timestamps', 'on');
            ini_set('opcache.revalidate_freq', 0);
        }
        else {
            // Ensure that no other code defines this.
            define('DRUPAL_TEST_IN_CHILD_SITE', FALSE);
        }
    }
    // Set the Drupal custom error handler.
    set_error_handler('_drupal_error_handler');
    set_exception_handler('_drupal_exception_handler');
    static::$isEnvironmentInitialized = TRUE;
}