php - Drupal function basic usage -

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i learning drupal , found using

drupal_add_js( array('philquotes' => array("json_url" => $json_url)), 'setting');

and says converted 

drupal.settings.philquotes.json_url

and used pass php variable js. got doubt used create js variable in php can accessible in js or other meaning there in ?

drupal_add_js function can used add setting, can used add file or inline javascript. drupal has documentation in api. see drupal_add_js documentation @ http://api.drupal.org/api/drupal/includes--common.inc/function/drupal_add_js/7


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