thinkphp/library/think/Loader.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2017 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
{
    protected static $instance = [];
    // 类名映射
    protected static $map = [];

    // 命名空间别名
    protected static $namespaceAlias = [];

    // PSR-4
    private static $prefixLengthsPsr4 = [];
    private static $prefixDirsPsr4    = [];
    private static $fallbackDirsPsr4  = [];

    // PSR-0
    private static $prefixesPsr0     = [];
    private static $fallbackDirsPsr0 = [];

    // 自动加载的文件
    private static $autoloadFiles = [];

    // 自动加载
    public static function autoload($class)
    {
        // 检测命名空间别名
        if (!empty(self::$namespaceAlias)) {
            $namespace = dirname($class);
            if (isset(self::$namespaceAlias[$namespace])) {
                $original = self::$namespaceAlias[$namespace] . '\\' . basename($class);
                if (class_exists($original)) {
                    return class_alias($original, $class, false);
                }
            }
        }

        if ($file = self::findFile($class)) {

            // Win环境严格区分大小写
            if (IS_WIN && pathinfo($file, PATHINFO_FILENAME) != pathinfo(realpath($file), PATHINFO_FILENAME)) {
                return false;
            }

            __include_file($file);
            return true;
        }