How to get node id in a block_view theme page?

Question

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?

Answer 1

You want menu_get_object() to obtain the node object when visiting a node page.

Answer 2

You can also do this (show a node's field in a block on only two pages) without a custom module. Make a block view showing this field. On the block configuration page make it display only on the two URLs that you want.