PHP - 无法理解此代码。 [关闭]

Question

I have code here on a website I've taken over and I just can't get my head around it.

Could someone please explain to me what is exactly going on. I have a good knowledge of PHP but this baffles me.

Thanks

function decawave_preprocess_field(&$vars) {
if($vars['element']['#field_name'] == "field_resource_public_pdf" || $vars['element']['#field_name'] == "field_resource_pdf") {
$vars['items'][0]['#disclaimer'] = !empty($vars['element']['#object']->field_disclaimer) ? $vars['element']['#object']->field_disclaimer[LANGUAGE_NONE][0]['value'] : 0;} 
}

Answer 1

If value of $vars['element']['#field_name'] is equal (note type juggling here) to 'field_resource_public_pdf' or $vars['element']['#field_name'] is equal (type juggling again) to "field_resource_pdf" string do the following:

Execute empty($vars['element']['#object']->field_disclaimer) (doc for this function) function, if it returns false, than assign value of $vars['element']['#object']->field_disclaimer[LANGUAGE_NONE][0]['value'] to $vars['items'][0]['#disclaimer']. Otherwise (if [empty][2]($vars['element']['#object']->field_disclaimer)returns true, assign 0 to $vars['items'][0]['#disclaimer'] .

The code is pretty straightforward, but I'd note that function itself is written very poorly.