Can I use js variables in Php?

Question

Can I use js variables in Php?
For example,I want to set text from textarea tag to session by using php and copy it to another textarea tag from another page.

Answer 1

You need to use ajax for that.

var xml = new XMLHttpRequest();
xml.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
xml.open("POST", "textarea.php", true);
xml.send("data=" + document.getElementById("textarea").value);

textarea.php
<?php
session_start();
$_SESSION["textarea"] = $_POST["data"];
?>
untested

Answer 2

Big thanks