Problem with post_ID

Hi guys

I am trying to get the PHP code widget to do something very simple – echo the value of a custom field on a per-post basis.

In post #553, I’ve defined custom field “foobarbaz” with value “garply“.

In my PHP code widget, I have:

<?php echo get_post_meta($post->ID, ‘foobarbaz’, true); ?>

…nothing.

I’ve also tried (the post ID is 553)

<?php echo get_post_meta(‘553’, ‘foobarbaz’, true); ?>

That works. Is there any way I can figure out why it’s not picking up the post number?