Looks up a field value for the current item in one of several places, in this order:
1. The first ProductFiles entry. 2. Additional ProductFiles in the order they occur. 3. The attribute value for the item in a hash list. 4. Blank
A common user error is to do this:
[loop search=" fi=foo se=bar "] [loop-field foo_field] [/loop]
In this case, you are searching the table foo for a string of bar. When it is found, you wish to display the value of foo_field. Unless foo is in ProductFiles and the code is not present in a previous product file, you will get a blank or some value you don't want. What you really want is [loop-data foo field], which specifically addresses the table foo. See also [PREFIX-param] and [PREFIX-pos].