Inside the loop this works. If you are trying to access the variable on an early hook (such as init) then it won’t work. I can’t help you further here. You need to ask your own specific and detailed question.

CommentedOct 16, 2015 at 13:54

Hey thanks for the comment .Sadly I got no question asking power anymore on SO. Could you direct me to some other stream where you could help me. Thanks a lot

CommentedOct 19, 2015 at 6:35

$id = $post->ID – with a capital ID

CommentedApr 22, 2017 at 9:11 

See @Samyer’s 2017 Update. Using $product->id will trigger this message: Product properties should not be accessed directly

CommentedMay 5, 2017 at 8:56