ElggInstaller::batchInstall PHP Method

    public function batchInstall(array $params, $createHtaccess = FALSE)
    {
        restore_error_handler();
        restore_exception_handler();
        $defaults = array('dbhost' => 'localhost', 'dbprefix' => 'elgg_', 'language' => 'en', 'siteaccess' => ACCESS_PUBLIC, 'site_guid' => 1);
        $params = array_merge($defaults, $params);
        $requiredParams = array('dbuser', 'dbpassword', 'dbname', 'sitename', 'wwwroot', 'dataroot', 'displayname', 'email', 'username', 'password');
        foreach ($requiredParams as $key) {
            if (empty($params[$key])) {
                $msg = _elgg_services()->translator->translate('install:error:requiredfield', array($key));
                throw new InstallationException($msg);
            }
        }
        // password is passed in once
        $params['password1'] = $params['password2'] = $params['password'];
        if ($createHtaccess) {
            $rewriteTester = new ElggRewriteTester();
            if (!$rewriteTester->createHtaccess($params['wwwroot'], Directory\Local::root()->getPath())) {
                throw new InstallationException(_elgg_services()->translator->translate('install:error:htaccess'));
            }
        }
        $this->setInstallStatus();
        if (!$this->status['config']) {
            if (!$this->createSettingsFile($params)) {
                throw new InstallationException(_elgg_services()->translator->translate('install:error:settings'));
            }
        }
        if (!$this->connectToDatabase()) {
            throw new InstallationException(_elgg_services()->translator->translate('install:error:databasesettings'));
        }
        if (!$this->status['database']) {
            if (!$this->installDatabase()) {
                throw new InstallationException(_elgg_services()->translator->translate('install:error:cannotloadtables'));
            }
        }
        // load remaining core libraries
        $this->finishBootstraping('settings');
        if (!$this->saveSiteSettings($params)) {
            throw new InstallationException(_elgg_services()->translator->translate('install:error:savesitesettings'));
        }
        if (!$this->createAdminAccount($params)) {
            throw new InstallationException(_elgg_services()->translator->translate('install:admin:cannot_create'));
        }
    }

<?php

/**
 * Sample cli installer script
 */
require_once dirname(dirname(__FILE__)) . "/ElggInstaller.php";
$installer = new ElggInstaller();
$params = array('dbuser' => '', 'dbpassword' => '', 'dbname' => '', 'sitename' => '', 'wwwroot' => '', 'dataroot' => '', 'displayname' => '', 'email' => '', 'username' => '', 'password' => '');
// install and create the .htaccess file
$installer->batchInstall($params, TRUE);