Pagekit\Installer\Helper\Composer::getComposer PHP Method

    protected function getComposer($packagist = false)
    {
        $config = $this->blueprint;
        $config['config'] = ['vendor-dir' => $this->paths['path.packages'], 'cache-files-ttl' => 0];
        $config['require'] = $this->packages;
        if (!$packagist) {
            $config['repositories'][] = ['packagist' => false];
        }
        // set memory limit, if < 512M
        $memory = trim(ini_get('memory_limit'));
        if ($memory != -1 && $this->memoryInBytes($memory) < 512 * 1024 * 1024) {
            @ini_set('memory_limit', '512M');
        }
        Factory::bootstrap(['home' => $this->paths['path.temp'] . '/composer', 'cache-dir' => $this->paths['path.temp'] . '/composer/cache']);
        $composer = Factory::create($this->getIO(), $config);
        $composer->setLocker(new Locker($this->getIO(), new JsonFile(preg_replace('/\\.php$/i', '.lock', $this->file)), $composer->getRepositoryManager(), $composer->getInstallationManager(), json_encode($config)));
        return $composer;
    }