PHP / JavaScript：如何将变量从一页传递到另一页

Question

I am new to PHP and hope someone can help me with this.

I have a page ( index.php ) where users can select a language. If no language is selected than the page URL is just index.php which defaults to English. If they select a language than the page gets reload and the variable ?lang=xy is added to the URL which defines the page language. Eg for German the page URL would then be index.php?lang=de .

So far everything works as intended.

Now I have a navbar on the index page that allows to navigate to other pages which are all saved as separate php files (like page1.php, page2.php, page3.php etc.).

How can I manage that if someone has selected a language on the index page and then navigates to another page that the language variable is passed along to all other pages ? Eg for German the other pages shoud be page1.php?lang=de, page2.php?lang=de, page3.php?lang=de etc.

I know I can use $_GET["lang"] on each page to fetch the variable but couldn't find a way to pass this on from the index page to other pages using PHP or JavaScript/jQuery, ideally in a way that I can set this more general instead of separately for every single link.

Note:
I am using undordered lists with standard links to create my navbar, eg:

<li><a href="page1.php">Page1</a></li>

Can someone help me with this ?

Many thanks in advance.

Answer 1

You can use cookies to do so

setcookie(name, value, expire, path, domain, secure, httponly);

ie:

setcookie('language', 'german', 60000,"/");

and then check this wherever with

$_COOKIE["language"]

http://php.net/manual/en/features.cookies.php reference

Answer 2

you can use sessions to pass variables to any page,it's more secure than cookies as it's a server side,

example:

After Posting Data:

<?php
    session_start();
        if(isset($_POST)){
        $var_name=$this->db->real_escape_string($_POST['input_name']);
        $_SESSION['var1_sess']=true;
        $_SESSION['var1_sess']=$var_name;
        }
?>

note :session_start() must be in the first line of the file.

Answer 3

If you are using to select languages, just add onchange event to then submit the form to index.php

<form action="index.php">
    <select name="lang" onchange="javascript:this.form.submit()">
        <option value="en">English</option>
        <option value="xy">XY</option>
    </select>
</form>

and in the same page

<?php  
$lang = $_GET['lang'];
if(empty($lang)){
    $lang = "en";
}
?>

Then pass the $lang to where you want to

<li><a href="page1.php?<?php echo $lang; ?>">Page1</a></li>