think\Process::isSigchildEnabled PHP Method

    protected function isSigchildEnabled()
    {
        if (null !== self::$sigchild) {
            return self::$sigchild;
        }
        if (!function_exists('phpinfo')) {
            return self::$sigchild = false;
        }
        ob_start();
        phpinfo(INFO_GENERAL);
        return self::$sigchild = false !== strpos(ob_get_clean(), '--enable-sigchild');
    }