Magento 2: Load the another store page when URLs result in 404s on the current store (by the request path)

Lexim/Seo/etc/frontend/events.xml

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <!-- Detect 404 page and switch store -->
    <!-- event controller_action_predispatch_cms_noroute_index. It will call only for 404 pages. -->
    <event name="controller_action_predispatch_cms_noroute_index">
        <observer name="check_404_and_redirect_to_fr" instance="Lexim\Seo\Observer\NotFoundRedirectHandler" />
    </event>
</config>

Lexim/Seo/Observer/NotFoundRedirectHandler.php

<?php
declare(strict_types=1);

namespace Lexim\Seo\Observer;

use Magento\Framework\App\ActionFlag;
use Magento\Framework\App\ActionInterface;
use Magento\Framework\App\Request\Http;
use Magento\Framework\App\ResponseInterface;
use Magento\Framework\App\Http\Context as HttpContext;
use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\Exception\NoSuchEntityException;

use Magento\Store\Api\Data\StoreInterface;
use Magento\Store\Api\StoreCookieManagerInterface;
use Magento\Store\Model\StoreManagerInterface;
use Magento\UrlRewrite\Model\UrlFinderInterface;
use Magento\UrlRewrite\Service\V1\Data\UrlRewrite;

/**
 * Class NotFoundRedirectHandler
 *
 * @package Lexim\Seo\Observer
 */
class NotFoundRedirectHandler implements ObserverInterface
{
    /** @var ResponseInterface */
    private $_responseInterface;

    /** @var Http */
    private $_request;

    /** @var ActionFlag */
    private $_actionFlag;

    /** @var StoreManagerInterface */
    private $_storeManagerInterface;

    /** @var UrlFinderInterface */
    private $_urlFinder;

    /** @var HttpContext */
    private $_httpContext;

    /** @var StoreCookieManagerInterface */
    private $_storeCookieManager;


    /**
     * NotFoundRedirectHandler constructor.
     *
     * @param Http $request
     * @param ActionFlag $actionFlag
     * @param ResponseInterface $responseInterface
     * @param StoreManagerInterface $_storeManagerInterface
     * @param UrlFinderInterface $_urlFinder
     * @param HttpContext $_httpContext
     * @param StoreCookieManagerInterface $_storeCookieManager
     */
    public function __construct(
        Http                        $request,
        ActionFlag                  $actionFlag,
        ResponseInterface           $responseInterface,
        StoreManagerInterface       $_storeManagerInterface,
        UrlFinderInterface          $_urlFinder,
        HttpContext                 $_httpContext,
        StoreCookieManagerInterface $_storeCookieManager,

    )
    {
        $this->_request = $request;
        $this->_actionFlag = $actionFlag;
        $this->_responseInterface = $responseInterface;
        $this->_storeManagerInterface = $_storeManagerInterface;
        $this->_urlFinder = $_urlFinder;
        $this->_httpContext = $_httpContext;
        $this->_storeCookieManager = $_storeCookieManager;
    }

    /**
     * @param Observer $observer
     *
     * @return void
     */
    public function execute(Observer $observer)
    {
        $getFullActionName = $this->_request->getFullActionName(); // _noroute_index, cms_noroute_index
        $getRequestString = $this->_request->getRequestString(); // "/what-is-adaptive-clothing-fr"
        $getRequestString = ltrim($getRequestString, "/");
        $isAjax = intval($this->_request->isAjax()); // 0, 1
        $storeCode = $this->getCurrentStoreCode();

        if (
            in_array($getFullActionName, ['cms_noroute_index', '_noroute_index']) &&
            $isAjax == 0 &&
            $storeCode === 'english'
        ) {

            $allStores = $this->getAllStores();
            $frenchCode = 'french';
            $frenchStore = $allStores[$frenchCode] ?? null;
            if ($frenchStore) {
                $frenchId = $frenchStore->getId();
                $frRewrite = $this->findOneData($getRequestString, $frenchId);

                if ($frRewrite) {
                    // Switch CA Store from english to french
                    $this->_httpContext->setValue('store', $frenchCode, $frenchCode);
                    $this->_storeCookieManager->setStoreCookie($frenchStore);

                    // Prevent the default action from being executed
                    $this->_actionFlag->set('', ActionInterface::FLAG_NO_DISPATCH, true);

                    // Redirect to the current URL in french
                    $this->_responseInterface->setRedirect($getRequestString);
                }
            }
        }

    }

    /**
     * @param $requestPath
     * @param $storeId
     *
     * @return UrlRewrite|null
     */
    protected function findOneData($requestPath, $storeId)
    {
        return $this->_urlFinder->findOneByData(
            [
                UrlRewrite::REQUEST_PATH => $requestPath,
                UrlRewrite::STORE_ID => $storeId
            ]
        );
    }

    /**
     * @return StoreInterface[]
     */
    protected function getAllStores(): array
    {
        $stores = $this->_storeManagerInterface->getStores(true, true);
        if (isset($stores['admin'])) { // remove admin store
            unset($stores['admin']);
        }
        return $stores;
    }

    /**
     * @return string
     * @throws NoSuchEntityException
     */
    protected function getCurrentStoreCode(): string
    {
        $curStore = $this->getCurrentStore();
        return $curStore->getCode(); // english, french, us
    }

    /**
     * @return StoreInterface
     * @throws NoSuchEntityException
     */
    protected function getCurrentStore()
    {
        return $this->_storeManagerInterface->getStore();
    }

}

Bài tập sinh viên - Code Bezout, Nghịch đảo, Số dư Trung Hoa

 Bezout

#include<stdio.h>
#include<conio.h>

int Bezout(int a,int b)
{
    int d,x,y;
    int x1,x2,y1,y2,q,r;
    if(b<0)
    {
           return 0; /* Khong dung dieu kien */
           }
    else if(a<b || a==b)
    {
           return 0; /* Khong dung dieu kien */
           }     
    else if(b==0)
    {
         d = a; x = 1; y = 0;
         return (d,x,y);      
         }
    else
    {
        x1=0; x2=1; y1=1; y2=0;
        while(b>0)
        {
                  q=a/b; r=a-q*b; x=x2-q*x1; y=y2-q*y1;
                  a=b; b=r; x2=x1; x1=x; y2=y1; y1=y;
                  }
        d = a; x=x2; y=y2;
        return (d,x,y);
        }          
}       

int main()
{
    int d,x,y;
    Bezout(10,3);
    getch();
    }

Nghịch đảo

#include<stdio.h>
#include<conio.h>

int NghichDao(int a,int b)
{
    int d,x,y;
    int x1,x2,y1,y2,q,r,m;
    m=a;      
    if(b==0)
    {
         d = a; x = 1; y = 0;
         if(d>1)
         {
                 return 0; /* Khong ton tai */
                 }
         else if(d==1)
         {
                 return (y%m);
                 }          
         }
    else
    {
        x1=0; x2=1; y1=1; y2=0;
        while(b>0)
        {
                  q=a/b; r=a-q*b; x=x2-q*x1; y=y2-q*y1;
                  a=b; b=r; x2=x1; x1=x; y2=y1; y1=y;
                  }
        d = a; x=x2; y=y2;
        if(d>1)
        {
                 return 0; /* Khong ton tai */
                 }
        else if(d==1)
        {
                 return (y%m);
                 }      
        }             
}       

int main()
{
    int a,b;
    printf("%d", NghichDao(3,35));
    getch();
}

Số dư Trung Hoa

#include<stdio.h>
#include<conio.h>

int NghichDao(int a,int b)
{
    int d,x,y;
    int x1,x2,y1,y2,q,r,m;
    m=a;      
    if(b==0)
    {
         d = a; x = 1; y = 0;
         if(d>1)
         {
                 return 0; /* Khong ton tai */
                 }
         else if(d==1)
         {
                 return (y%m);  
                 }          
         }
    else
    {
        x1=0; x2=1; y1=1; y2=0;
        while(b>0)
        {
                  q=a/b; r=a-q*b; x=x2-q*x1; y=y2-q*y1;
                  a=b; b=r; x2=x1; x1=x; y2=y1; y1=y;
                  }
        d = a; x=x2; y=y2;
        if(d>1)
        {
                 return 0; /* Khong ton tai */
                 }
        else if(d==1)
        {
                 return (y%m);
                 }      
        }             
}

int SDTH(int m1, int m2, int m3, int n1, int n2, int n3)
{
    int tich = n1*n2*n3;
    int tich1 = n2*n3;
    int tich2 = n1*n3;
    int tich3 = n1*n2;
    int c1 = NghichDao(n1,tich1);
    int c2 = NghichDao(n2,tich2);
    int c3 = NghichDao(n3,tich3);
    int x0 = m1*tich1*c1 + m2*tich2*c2 + m3*tich3*c3;
    return x0;
}     

int main()
{
    printf("KQ = %d", SDTH(2, 3, 2, 3, 5, 7)); 
    getch();
}