thinkphp/library/think/Loader.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;

use think\exception\ClassNotFoundException;

class Loader
{
    /**
     * 类名映射信息
     * @var array
     */
    protected static $classMap = [];

    /**
     * 类库别名
     * @var array
     */
    protected static $classAlias = [];

    /**
     * PSR-4
     * @var array
     */
    private static $prefixLengthsPsr4 = [];
    private static $prefixDirsPsr4    = [];
    private static $fallbackDirsPsr4  = [];

    /**
     * PSR-0
     * @var array
     */
    private static $prefixesPsr0     = [];
    private static $fallbackDirsPsr0 = [];

    /**
     * 需要加载的文件
     * @var array
     */
    private static $files = [];

    /**
     * Composer安装路径
     * @var string
     */
    private static $composerPath;

    // 获取应用根目录
    public static function getRootPath()
    {
        if ('cli' == PHP_SAPI) {