DRUPAL 7
I have two content Types... BINS and LOGS.
A BIN has MANY LOGS.
LOG has a text field called BINID.  Example ("PF1022").
If you goto /bin/pf1022, then you will goto the BIN page.

FYI... I am submitting the LOGS from an ANDROID application over services 3.3.
So I want to create a custom field in LOG that is =  "/bin/" + [BINID]



TO do this, I was thinking of using the COMPUTED FIELD, so I could store this value in the DB and use it with views... or do it dynamic.

In the Computed Code (PHP) section of the field...
$entity_field[0]['value'] = print_r ($entity);  will give me this...
[field_bin_id] => Array ( [und] => Array ( [0] => Array ( [value] => PF222 [format] => [safe_value] => PF222 ) ) )

This does not work...
//$entity_field[0]['value'] =$entity_field["field_bin_id"]["0"]["value"];

HOW can I output something like this...
"/bin/PF1022"?

and as an HTML link?