Drupal PHP Code

[scotisle]

Newbie question, sorry. I have a Drupal custom content type - "EXIF Image" that is posting metadata. It works, but I'd like to speed up the posting process by autopopulating the node title with metadata as well. I've enabled auto_nodetitle, but I'm stuck on the correct syntax for the PHP. I'm not a PHP progrmmer, and I don't even play one on TV. Could someone direct me to the correct syntax? I have a field__iptc_headline that I'm trying to reference. Not sure where the extra underscore came from, but it's working with EXIF module.

<?php
print render($content['field__iptc_headline']);
?>

Thanks so much! I cross-posted at Drupal and haven't gotten any replies.