I'm pretty new to drupal and I don't quite understand the callback function field. I get that the field will populate the "To:" field with addresses, I just don't know where I should put the callback function. Does it go in the pet.module file or just a custom php file somewhere on the site? A tutorial would be very helpful.

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dwightaspinwall’s picture

dwightaspinwall CreditAttribution: dwightaspinwall commented

You can put the function in any module of your own. Definitely don't want to alter the pet module itself for this. Think of it as a hook, if that helps.