php - Drupal 7, Update field when checkbox checked of specific content type -

problem: content type: news fields: - title (textbox) (machine name: title) - body (textarea) (machine name: body) - logo (file) (machine name: logo) - featured (checkbox) (machine name: featured_news)

i need show 1 featured news ordered changed date descending , other requirements.

how implement it? when checked featured field of 1 news checked other featured news should unchecked.

here steps followed:

• made module (newscheckbox)
• made functions

function newscheckbox_form_alter(&$form, $form_state, $form_id) {   if($form_id == 'my_form_id_replace_with_underscore') {     $form['#submit'][]='featured_news_update';   } }  function featured_news_update(){   $nodeid=getfeaturednews();   if($nodeid){     nodesavenews($nodeid);   } }  function nodesavenews($nodeid){   $node = node_load($nodeid); // 1 node id want load   $node->field_featured_news[$node->language][0]['value'] = '0';   node_save($node); } 

somehow working, there other way achieve it.