How to Assign JavaScript Variable Value to PHP Variable

How to assign javascript value to php variable without using cookie

try using this demo code

<script>
if (data) {
    var a =data;
    <?php $abc = "<script>document.write(a)</script>"?>   
}
if (!data) {
    console.log('no data');
}
</script>
<?php
   echo $abc;
?>

How to assign the javascript variable value to php variable

Javascript works on the user's computer, PHP works on your server. In order to send variables from JS to PHP and vice versa, you need communication such as a page load.

Have a look here on what you can do: How to pass JavaScript variables to PHP? or more specifically the first answer (https://stackoverflow.com/a/1917626/1311593)

Assign javascript value to php variable

I guess you can use cookies for it.

1) First add a cookie jquery plugin.

2) Then store that window width in a cookie variable.

3) Access your cookie in PHP like $_COOKIE['variable name'].(http://www.w3schools.com/php/php_cookies.asp)

How do I pass JavaScript variables to PHP?

You cannot pass variable values from the current page JavaScript code to the current page PHP code... PHP code runs at the server side, and it doesn't know anything about what is going on on the client side.

You need to pass variables to PHP code from the HTML form using another mechanism, such as submitting the form using the GET or POST methods.

<DOCTYPE html>
<html>
  <head>
    <title>My Test Form</title>
  </head>

  <body>
    <form method="POST">
      <p>Please, choose the salary id to proceed result:</p>
      <p>
        <label for="salarieids">SalarieID:</label>
        <?php
          $query = "SELECT * FROM salarie";
          $result = mysql_query($query);
          if ($result) :
        ?>
        <select id="salarieids" name="salarieid">
          <?php
            while ($row = mysql_fetch_assoc($result)) {
              echo '<option value="', $row['salaried'], '">', $row['salaried'], '</option>'; //between <option></option> tags you can output something more human-friendly (like $row['name'], if table "salaried" have one)
            }
          ?>
        </select>
        <?php endif ?>
      </p>
      <p>
        <input type="submit" value="Sumbit my choice"/>
      </p>
    </form>

    <?php if isset($_POST['salaried']) : ?>
      <?php
        $query = "SELECT * FROM salarie WHERE salarieid = " . $_POST['salarieid'];
        $result = mysql_query($query);
        if ($result) :
      ?>
        <table>
          <?php
            while ($row = mysql_fetch_assoc($result)) {
              echo '<tr>';
              echo '<td>', $row['salaried'], '</td><td>', $row['bla-bla-bla'], '</td>' ...; // and others
              echo '</tr>';
            }
          ?>
        </table>
      <?php endif?>
    <?php endif ?>
  </body>
</html>

How to assign php variable in JavaScript value assign?

You simply cannot do that, you need to understand the difference between client/server side programming, you cannot assign Javascript value to PHP variable, yea but you can assign PHP value to your javascript

Twig how to assign a JS variable to PHP variable

It seems Twig does not allow such a thing: https://craftcms.stackexchange.com/questions/21742/local-storage-in-twig

How to assign php variable value into javascript variable

echo it. But Remember to follow the sequence of definition -

<?php
    $name= "Rama";
?>

<script type="text/javascript">
    var jvalue = 'Hi, <?php echo $name; ?>';
</script>

<?php
$abc = "<script>document.write(jvalue)</script>";
echo $abc;
?>