如何为网站添加双语切换的功能？

通过以下代码，大家可以实现一个双语切换的网站。

视频讲解参见：https://www.bilibili.com/video/BV1M7411c7BT/

index.php

<?php

session_start();

include "language.php";

include "switch.php";

?>


<a href="home.php">Home

<?php

echo $name;

echo $university;

?>

home.php

<?php

session_start();

include "language.php";

include "switch.php";
?>


<a href="index.php">Index

<?php

echo $name;

echo $university;

?>

welcome.php

<?php

session_start();

include "language.php";

include "switch.php";

?>

<a href="home.php">Home
<a href="index.php">Index


<?php

echo $welcome;

?>

language.php

<?php

if(isset($_GET["language"]))
{
    $_SESSION["language"] = $_GET["language"];
}

if(isset($_SESSION["language"]))
{
    include "strings_".$_SESSION["language"].".php";
}
else
{
    include "strings_zh.php";
}

?>

switch.php

<?php

echo '

<a href="?language=zh">中文
<a href="?language=en">English

<a href="?language=fr">French
';

?>

strings_en.php

<?php

$name = "Alex Han";

$university = "BLCU";

$welcome = "Welcome";


?>

strings_zh.php

<?php

$name = "韩林涛";

$university = "北京语言大学";

$welcome = "欢迎！";

?>

strings_fr.php

<?php

$name = "Alex Han";

$university = "BLCU";

$welcome = "Bienvenue sur mon site";

?>