How to get node id in a block_view theme page? I have added blocks to my custom module. A same block should be displayed in two pages. I have to display the field
 $node->field_tag['und']['0']['value']; 
in my block.

$nid = explode("/", $_GET['q']);
$node = node_load($nid[1]);


I got the node id by this. When it goes to another url it is not loading.
So how can I get the nid in the block_view theme page without using the url?
You want menu_get_object() to obtain the node object when visiting a node page.