vendor/topthink/framework/src/think/route/dispatch/Url.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2021 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace think\route\dispatch;

use think\exception\HttpException;
use think\helper\Str;
use think\Request;
use think\route\Rule;

/**
 * Url Dispatcher
 */
class Url extends Controller
{

    public function __construct(Request $request, Rule $rule, $dispatch)
    {
        $this->request = $request;
        $this->rule    = $rule;
        // 解析默认的URL规则
        $dispatch = $this->parseUrl($dispatch);

        parent::__construct($request, $rule, $dispatch, $this->param);
    }

    /**
     * 解析URL地址
     * @access protected
     * @param  string $url URL
     * @return array
     */
    protected function parseUrl(string $url): array
    {
        $depr = $this->rule->config('pathinfo_depr');
        $bind = $this->rule->getRouter()->getDomainBind();

        if ($bind && preg_match('/^[a-z]/is', $bind)) {
            $bind = str_replace('/', $depr, $bind);
            // 如果有域名绑定
            $url = $bind . ('.' != substr($bind, -1) ? $depr : '') . ltrim($url, $depr);
        }

        $path = $this->rule->parseUrlPath($url);
        if (empty($path)) {
            return [null, null];
        }

        // 解析控制器
        $controller = !empty($path) ? array_shift($path) : null;