在think\config\driver 下增加两个类 Php.php 和 Yaml.php

class Php
{
    protected $config;
    public function __construct($config)
    {
        $this->config = $config;
    }
    public function parse()
    {
        return include $this->config;
    }
}

class Yaml
{
    protected $config;

    public function __construct($config)
    {
        $this->config = $config;
    }

    public function parse()
    {
        return yaml_parse_file($this->config);
    }
}

然后 \think\Config.php 中注释掉判断语句

    protected function loadFile($file, $name)
    {

        $name = strtolower($name);
        $type = pathinfo($file, PATHINFO_EXTENSION);
//        if ('php' == $type) {
//            return $this->set(include $file, $name);
//        } elseif ('yaml' == $type && function_exists('yaml_parse_file')) {
//            return $this->set(yaml_parse_file($file), $name);
//        }

        return $this->parse($file, $type, $name);
    }