Can't pass php variable to javascript in Drupal 7 [duplicate]

You have to say drupal where to put the javascript like this:

$options = array(
'weight' => 1000, // High number to push this file to the bottom of the list
'scope' => 'footer' // This will output the JS file in the footer scope, so at the end     of   the document
);

drupal_add_js(drupal_get_path('module', 'modulename') .'/script.js', $options);

But like i learned a more sophisticated way would be to use Drupal.behaviors.

Look at my question: How to pass values from php to javascript properly?

Make sure you call for jquery setting inside Drupal behaviour, you can do like this:

(function ($) {
    Drupal.behaviors.example_name = {
        attach: function(context) {
            alert(Drupal.settings.my_var.orderid);
        }
    }
})(jQuery);

or you can call inside jQuery's .ready() event (less preferable than behaviours approach in Drupal world):

jQuery(document).ready(function($) {
   alert(Drupal.settings.my_var.orderid);
});

These both approaches ensure that jQuery is loaded before calling a variable.

P.S. I recommend using console.log instead of alert for quick debugging, like this:

console.log(Drupal.settings.my_var.orderid);

Then go to your developer console / firebug (depending on browser you use) and you'll see an output in console.