切换变量以更改href

Question

In my footer.php I want to give people the option to change the language from english to german. I want to do this manually, because I have a lot of external links, so I do not want to use plugins since it should be easy with php.

All I need to do is to change the href and the content between the anchor.

<?php 
  session_start();
  if($_SESSION["language_is_german"])
  {
    echo "<a href='www.example.com?lang=en'>EN</a>";
    $_SESSION["language_is_german"] = true;
  }
  else
  {
    echo "<a href='www.example.com?lang=de'>DE</a>"
    $_SESSION["language_is_german"] = false;
  }
?>

This is the way I thought it might work, but it doesn't..

Answer 1

You cannot set PHP Variables in JavaScript:

onclick="$language_is_german = true"

The above code is not valid. You need to use Sessions for this! Or you need to use JavaScript for this. If you are using PHP, you can do something like this:

session_start();
$_SESSION["language_is_german"] = false;

And in the setting PHP, you can do something like this:

session_start();
$_SESSION["language_is_german"] = true;

Finally, your if has to be this way:

<?php 
    if($_SESSION["language_is_german"])
       echo "<a href='www.example.com?lang=en'>EN</a>";
    else
       echo "<a href='www.example.com?lang=de'>DE</a>"
?>