thinkphp/library/think/Facade.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2018 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think;

class Facade
{
    /**
     * 绑定对象
     * @var array
     */
    protected static $bind = [];

    /**
     * 始终创建新的对象实例
     * @var bool
     */
    protected static $alwaysNewInstance;

    /**
     * 绑定类的静态代理
     * @static
     * @access public
     * @param  string|array  $name    类标识
     * @param  string        $class   类名
     * @return object
     */
    public static function bind($name, $class = null)
    {
        if (__CLASS__ != static::class) {
            return self::__callStatic('bind', func_get_args());
        }

        if (is_array($name)) {
            self::$bind = array_merge(self::$bind, $name);
        } else {
            self::$bind[$name] = $class;
        }
    }

    /**
     * 创建Facade实例
     * @static
     * @access protected
     * @param  string    $class          类名或标识
     * @param  array     $args           变量
     * @param  bool      $newInstance    是否每次创建新的实例
     * @return object
     */
    protected static function createFacade($class = '', $args = [], $newInstance = false)
    {
        $class = $class ?: static::class;