vendor/topthink/think-template/src/facade/Template.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2019 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think\facade;

if (class_exists('think\Facade')) {
    class Facade extends \think\Facade
    {}
} else {
    class Facade
    {
        /**
         * 始终创建新的对象实例
         * @var bool
         */
        protected static $alwaysNewInstance;

        protected static $instance;

        /**
         * 获取当前Facade对应类名
         * @access protected
         * @return string
         */
        protected static function getFacadeClass()
        {}

        /**
         * 创建Facade实例
         * @static
         * @access protected
         * @return object
         */
        protected static function createFacade()
        {
            $class = static::getFacadeClass() ?: 'think\Template';

            if (static::$alwaysNewInstance) {
                return new $class();
            }

            if (!self::$instance) {
                self::$instance = new $class();
            }

            return self::$instance;

        }

        // 调用实际类的方法
        public static function __callStatic($method, $params)
        {