(未完成，待续)
把调用方法放在前面，方便理解

主要的思路

1. Api类继承Facade，重写了getFacadeAccessor()该方法，目的是为了，

2. 代码使用在Facade类中使用了 __callStatic，
   Api::apiTypeOne() 相当于实例化了 TypeOne类

api:apiTypeTwon() 相当于实例化了 TypeTwo 类
回调本实例，在署名函数中完成操作

namespace App\Admin\Controllers;
use App\Libraries\Api\apiTypeOne;
$content = Api::apiTypeOne($data,function (apiTypeOne $apiTypeOne) {

$header = 'Accept:text/xml,application/xml,application/xhtml+xml,text/html;';

$apiTypeOne->setHeaders($header);

}); 

Api.PHP 是外层的入口点，重写了getFacadeAccessor() 方法，根据自己的业务需求重写该方法，既可以通用的使用该设计模式

// file Api.PHP 
namespace App\Libraries;
use App\Libraries\Facade;
class Api extends Facade {
static public function getFacadeAccessor() {
    return \App\Libraries\Api\ApiImplement::class;
}
}

Facade.PHP 通过__callStatic 方法来实现通用

// file Facade.PHP
namespace App\Libraries;
use RuntimeException;
abstract class Facade {

static public $resolvedInstance;

static public $app;

/**

[getFacadeAccessor 获取访问器]
@return [type] [description]

*/

static public function getFacadeAccessor() {

throw new RuntimeException('Facade does not implement getFacadeAccessor method.');

}

/**
 * [getInstance <a href="https://www.jb51.cc/tag/huoqu/" target="_blank" class="keywords">获取</a>实例]
 * @return [object] [instance]
 */
static public function getFacadeRoot() {
    return static::resolveFacadeInstance(static::getFacadeAccessor());

}

static function resolveFacadeInstance($name) {

    if( is_object($name) ) {
        return $name;
    }
    if (isset(static::$resolvedInstance[$name])) {
        return static::$resolvedInstance[$name];
    }

    return static::$resolvedInstance[$name] = new $name();

}

/**
 * [__callStatic 魔术<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>]
 * @param  [string] $method [<a href="https://www.jb51.cc/tag/diaoyong/" target="_blank" class="keywords">调用</a>的<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>]
 * @param  [array] $args   [参数]
 * @return [mixed]         [mixed]
 */
static public function __callStatic($method,$args) {
    $instance = self::getFacadeRoot();

    if (! $instance) {
        throw new RuntimeException('A facade root has not been set.');
    }

    return $instance->$method(...$args);
}
}

api 子系统实现

//file ApiImplement.PHP
namespace App\Libraries\Api;
use Closure;
class ApiImplement {
/**
 * [apiTypeOne demo<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>]
 * @param  [type]  $data     [数据]
 * @param  Closure $callable [匿名<a href="https://www.jb51.cc/tag/hanshu/" target="_blank" class="keywords">函数</a> 的类.]
 * @return [type]            [object]
 */
public function apiTypeOne($data,Closure $callable) {
    return new TypeOne($data,$callable); 
}

/**
 * [apiTypTwo demo<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>2]
 * @param  [type]  $data     [数据]
 * @param  Closure $callable [匿名<a href="https://www.jb51.cc/tag/hanshu/" target="_blank" class="keywords">函数</a>的类.]
 * @return [type]            [object]
 */
public function apiTypTwo($data,Closure $callable) {
    return new TypeTwo($data,$callable); 
}
}

// api 子系统 apiTypeOne.PHP
namespace App\Libraries\Api;
use Closure;
class TypeOne{
protected $data;
protected $callable;
/**
 * @param array $data
 * @param callable $callback
 */
public function __construct($data,Closure $callback)
{
    $this->data    = $data;
  $this->callable = $callback;
  $callback($this);
}
public function setHeaders($header) {
    $this->header = $header;
}


/**
 * Get the string contents of the view.
 * @return string
 */
public function __toString()
{
    return $this->callable;

}
}
// api 子系统2 apiTypeTwo.PHP

namespace App\Libraries\Api;

use Closure;
class TypeTwo{
protected $data;
protected $callable;
/**
 * @param array $data
 * @param callable $callback
 */
public function __construct($data,Closure $callback)
{
    $this->data     = $data;
  $this->callable = $callback;
    $callback($this);
}
public function setHeaders($header) {
    $this->header = $header;
}


/**
 * Get the string contents of the view.
 * @return string
 */
public function __toString()
{
    return $this->callable;
}
}