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thinkphp5 “$this->redirect()” 到底经历了啥

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redirect方法，可以在自定义的控制器实现跳转的功能。看thinkphp 5.1源码发现它是在在jump trait中定义的一个方法。

Controller.php

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.
.
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use traits\controller\Jump;

class Controller
{
    use Jump;

    /**
     * 视图类实例
     * @var \think\View
     */
    protected $view;

    /**
     * Request实例
     * @var \think\Request
     */
    protected $request;

.
.
.
}

jump.php 可以看到它抛出一个异常

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<?php

.
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namespace traits\controller;

use think\Container;
use think\exception\HttpResponseException;
use think\Response;
use think\response\Redirect;

trait Jump
{
    .
    .
    .
    
    protected function redirect($url, $params = [], $code = 302, $with = [])
    {
        $response = new Redirect($url);

        if (is_integer($params)) {
            $code   = $params;
            $params = [];
        }

        $response->code($code)->params($params)->with($with);

        throw new HttpResponseException($response);
    }
    
   .
   .
   .
    
}

查看HttpResponseException可以发现它是Excepton的子类

HttpResponseException.php

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<?php
namespace think\exception;

use think\Response;

class HttpResponseException extends \RuntimeException
{
    protected $response;

    public function __construct(Response $response)
    {
        $this->response = $response;
    }

    public function getResponse()
    {
        return $this->response;
    }

}

RuntimeException是SPL中的类,它继承Exception

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class RuntimeException extends Exception {
}

到此我们知道了redirect()方法其实是抛出一个异常，那它是在哪里调用然后输出（跳转）呢？

从入口文件index.php开始。发现先加载base.php，然后执行App类的run方法。然后调用返回对象的send方法

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<?php
namespace think;

// 加载基础文件
require __DIR__ . '/../thinkphp/base.php';

// 支持事先使用静态方法设置Request对象和Config对象

// 执行应用并响应
Container::get('app')->run()->send();

App类,发现它catch了一个HttpResponseException，返回Redirect类型的Response 对象

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<?php
namespace think;

use think\exception\ClassNotFoundException;
use think\exception\HttpResponseException;
use think\route\Dispatch;

/**
 * App 应用管理
 */
class App implements \ArrayAccess
{
    const VERSION = '5.1.5';
    .
    .
    .
    
    // 执行应用程序
    public function run()
    {
        // 初始化应用
        $this->initialize();

        try {
            if ($this->bind) {
                // 模块/控制器绑定
                $this->route->bind($this->bind);
            } elseif ($this->config('app.auto_bind_module')) {
                // 入口自动绑定
                $name = pathinfo($this->request->baseFile(), PATHINFO_FILENAME);
                if ($name && 'index' != $name && is_dir($this->appPath . $name)) {
                    $this->route->bind($name);
                }
            }

            // 读取默认语言
            $this->lang->range($this->config('app.default_lang'));
            if ($this->config('app.lang_switch_on')) {
                // 开启多语言机制 检测当前语言
                $this->lang->detect();
            }

            $this->request->langset($this->lang->range());

            // 加载系统语言包
            $this->lang->load([
                $this->thinkPath . 'lang/' . $this->request->langset() . '.php',
                $this->appPath . 'lang/' . $this->request->langset() . '.php',
            ]);

            // 监听app_dispatch
            $this->hook->listen('app_dispatch');

            // 获取应用调度信息
            $dispatch = $this->dispatch;
            if (empty($dispatch)) {
                // 进行URL路由检测
                $dispatch = $this->routeCheck();
            }

            // 记录当前调度信息
            $this->request->dispatch($dispatch);

            // 记录路由和请求信息
            if ($this->debug) {
                $this->log('[ ROUTE ] ' . var_export($this->request->routeInfo(), true));
                $this->log('[ HEADER ] ' . var_export($this->request->header(), true));
                $this->log('[ PARAM ] ' . var_export($this->request->param(), true));
            }

            // 监听app_begin
            $this->hook->listen('app_begin');

            // 请求缓存检查
            $this->request->cache(
                $this->config('app.request_cache'),
                $this->config('app.request_cache_expire'),
                $this->config('app.request_cache_except')
            );

            // 执行调度
            $data = $dispatch->run();

        } catch (HttpResponseException $exception) {
            $data = $exception->getResponse();
        }

        $this->middlewareDispatcher->add(function (Request $request, $next) use ($data) {
            // 输出数据到客户端
            if ($data instanceof Response) {
                $response = $data;
            } elseif (!is_null($data)) {
                // 默认自动识别响应输出类型
                $isAjax = $request->isAjax();
                $type   = $isAjax ? $this->config('app.default_ajax_return') : $this->config('app.default_return_type');

                $response = Response::create($data, $type);
            } else {
                $response = Response::create();
            }
            return $response;
        });

        $response = $this->middlewareDispatcher->dispatch($this->request);

        // 监听app_end
        $this->hook->listen('app_end', $response);

        return $response;
    }

    .
    .
    .
}

继续看Redirect类父类Response的send方法。它设置了header头等

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<?php	

namespace think;

use think\response\Redirect as RedirectResponse;

class Response
{
     .
     .
     .

    /**
     * 发送数据到客户端
     * @access public
     * @return void
     * @throws \InvalidArgumentException
     */
    public function send()
    {
        // 监听response_send
        Container::get('hook')->listen('response_send', $this);

        // 处理输出数据
        $data = $this->getContent();

        // Trace调试注入
        if (Container::get('env')->get('app_trace', Container::get('app')->config('app.app_trace'))) {
            Container::get('debug')->inject($this, $data);
        }

        if (200 == $this->code && $this->allowCache) {
            $cache = Container::get('request')->getCache();
            if ($cache) {
                $this->header['Cache-Control'] = 'max-age=' . $cache[1] . ',must-revalidate';
                $this->header['Last-Modified'] = gmdate('D, d M Y H:i:s') . ' GMT';
                $this->header['Expires']       = gmdate('D, d M Y H:i:s', $_SERVER['REQUEST_TIME'] + $cache[1]) . ' GMT';

                Container::get('cache')->tag($cache[2])->set($cache[0], [$data, $this->header], $cache[1]);
            }
        }

        if (!headers_sent() && !empty($this->header)) {
            // 发送状态码
            http_response_code($this->code);
            // 发送头部信息
            foreach ($this->header as $name => $val) {
                header($name . (!is_null($val) ? ':' . $val : ''));
            }
        }

        $this->sendData($data);

        if (function_exists('fastcgi_finish_request')) {
            // 提高页面响应
            fastcgi_finish_request();
        }

        // 监听response_end
        Container::get('hook')->listen('response_end', $this);

        // 清空当次请求有效的数据
        if (!($this instanceof RedirectResponse)) {
            Container::get('session')->flush();
        }
    }

    .
    .
    .
}

最后应用终止时会执行shutdown处理方法。它在Error.php已经注册了shutdown方法为Error类的appShutdown方法

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<?php
 class Error
 {
    .
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    public static function register()
    {
        error_reporting(E_ALL);
        set_error_handler([__CLASS__, 'appError']);
        set_exception_handler([__CLASS__, 'appException']);
        register_shutdown_function([__CLASS__, 'appShutdown']);
    }
    .
    .
    .
}

appShutdown方法

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public static function appShutdown()
{
    if (!is_null($error = error_get_last()) && self::isFatal($error['type'])) {
        // 将错误信息托管至think\ErrorException
        $exception = new ErrorException($error['type'], $error['message'], $error['file'], $error['line']);

        self::appException($exception);
    }

    // 写入日志
    Container::get('log')->save();
}

OK.

另：thinkphp 5.0源码阅读参考：https://www.kancloud.cn/zmwtp/tp5/155311

------本文结束感谢阅读------
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