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How to hide a field when its value is set to zero

I want to hide a field on a node when its value is set to zero using a content type. Here is what I had done so far to achieve my goal.

function pay_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL) {   global $user;    if ($node->type=='salary_info' && $op=='presave') {     $public_holiday = $node->field_sstru_public_holiday[0]['value']; // here I get the value that I set to 0(No) or 1(YES) using a select list.       if ($public_holiday == 0) {       $nid = node_load(207919); // load node where i want to unset this field          unset($nid->field_pd_public_holiday[0]); // here iam wrong and confused      }     else {       drupal_set_message("HOLIDAY");     }   }

what should I do to unset my field?

This article was republished from its original source.
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How to hide a field when its value is set to zero

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