Services\ModuleInstaller::checkIfRequiredModulesExist PHP Method

    private function checkIfRequiredModulesExist()
    {
        $module_details = $this->config;
        $required_modules = isset($module_details['requires']) ? $module_details['requires'] : null;
        if ($required_modules) {
            $missing_modules = [];
            foreach ($required_modules as $required_module) {
                $split = explode('/', $required_module);
                if (sizeof($split) == 2) {
                    // If module contains vendor
                    $vendor = $split[0];
                    $module_alias = $split[1];
                    $module = Module::where('alias', $module_alias)->where('vendor', $vendor)->first();
                } else {
                    $module_alias = $split[0];
                    $module = Module::where('alias', $module_alias)->first();
                }
                if (!$module) {
                    $missing_modules[] = $required_module;
                }
            }
            $missing = implode(', ', $missing_modules);
            throw new Exception("Required module(s) {$missing} doesn't exist.");
        }
    }