php - Fatal error: Can't use method return value in write context in empty() -

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i getting following error why this?

fatal error: can't use method return value in write context 

foreach ($transfer_nids $nid) {     $wrapper = entity_metadata_wrapper('node', $nid);     $result[] = array(         's_name' => empty($wrapper->field_s->value()->title) ? 'no data' : $wrapper->field_s->value()->title,         'r_name' => empty($wrapper->title->value()) ? 'no data' : $wrapper->title->value(),         'max' => empty($wrapper->field_max->value()) ?  'no data' : $wrapper->field_max->value(),         );   }  return ai_wrap_result($result, 'info'); }

in (older versions) of php (<5.5) can't use empty() on return of function directly, compiler reasons.

what need instead save result in intermediary variable , check if empty() instead, i.e.,

foreach ($transfer_nids $nid) {     $wrapper = entity_metadata_wrapper('node', $nid);      $rname = $wrapper->title->value();     $max = $wrapper->field_max->value();     $result[] = array(         's_name' => empty($wrapper->field_s->value()->title) ? 'no data' : $wrapper->field_s->value()->title,         'r_name' => empty($rname) ? 'no data' : $wrapper->title->value(),         'max' => empty($max) ?  'no data' : $wrapper->field_max->value(),     ); } return ai_wrap_result($result, 'info');

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