Here's javascript code that i have
var randomnum = 30;
and here's PHP code
<?php $_SESSION['numbertoguess'] = '<script>document.write(randomnum)</script>';?>
But this is not passing the value But when i am trying this code below, it works. It gives session variable that the value 'a sample thing'.
<?php $_SESSION['numbertoguess'] = 'a sample thing';?>
Look at the following code. The PHP session is assigned to 30 from the Javascript value. however am not sure if this is good way for implementation.
<?php
// Start the session
session_start();
?>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Html Page Title</title>
</head>
<body>
<script>
var randomnum = 30;
</script>
<?php $_SESSION['numbertoguess'] = '<script>document.write(randomnum)</script>';?>
<?php echo $_SESSION['numbertoguess']; ?>
</body>
</html>
You can't access Session directly in JavaScript.
You can make a hidden field and pass it to your page and then use JavaScript to retrieve the object via document.getElementById
来源：https://stackoverflow.com/questions/47522878/how-to-assign-javascript-variable-to-php-session-variable