how to pass js variable to drupal php variable????

[hmdnawaz]

 

I want to pass a js variable to drupal php variable and display its value. Following is my code.

 

$form['title'] = array(

  '#type' => 'select',

  '#title' => t('titles'),

  '#page callback' => 'drupal_get_form',

  '#page arguments' => array('test_select'),

  '#access callback' => TRUE,

  '#options' => $options,

  '#prefix' => '<div>',

  '#postfix' => '</div>',

  '#attributes' => array('onchange' => 'test_change')

);

 

$form['titletext'] = array(

  '#type' => 'textfield',

  '#title' => 'title',

);

 

drupal_add_js('$('.$form['title']['select'].').change(function () {

  var str ="";

  '.$a.' = "";

  $("'.$form['title']['select'].' option:selected").each(function () {

    str += $(this).text() + " ";

  });

})

.change();', 'inline', 'header');

 

 

I want to assign that str variable to the textfield value or simply assign that variable to drupal php variable and display it on the page.