如何使用JavaScript在会话中传递当前URL

Question

I have a button, I want when I click on it, current url passes on the session. something like this:

$(".btn").click(function(e) {
     var url = window.location.href;
     // how to pass url in the session ?
});

Actually here is my structure:

// pageA.php
<input class="btn" value="set current url to session" />

<script>
   $(".btn").click(function(e) {
     var url = window.location.href;
     // how to pass url in the session ?
  });
</script>


// pageB.php
if (isset($_SESSION['url'])){
    $previous_url = $_SESSION['url'];
    header('Location: $previous_url');
}

Now I want to know how can I pass a javascript variable in the php session? Or in other word, how can I set var url = window.location.href; in the $_SESSION['url'] ?

Answer 1

You can't do that directly because PHP is server-side and JavaScript is client-side and they simply can't "see" each other.

You can eg. pass your variable (url) to PHP using Ajax (eg. jQuery.ajax() method) and then save it in your session like any other user data.

Answer 2

To send a Javascript value to PHP you'd need to use AJAX.

JS :

$(".btn").click(function(e) {
    var url = window.location.href;
    $.post('pageA.php', {url : url});
}

On your server, you would need to receive the url sent in the post like following :

PHP :

$_SESSION['url'] = $_POST['url'];

Hope this helps.