Smarty modifer/plugin to get a labels from an array - php

Question

This is the example array I get sent from the CMS to Smarty.
[field] => Array
(
[value] => 19
[options] => Array
(
[labels] => Array
(
[0] => --- Select ---
[1] => John
[2] => Mark
[3] => Luke
[4] => Philip
)
[values] => Array
(
[0] =>
[1] => 15
[2] => 1
[3] => 19
[4] => 17
)
)
So I would normally write {$field.value} or {html_options values=$field.options.values output=$field.options.labels selected=$field.value}
My question is how can I easily get the label from the value. I tried this: {$field.options.labels[$field.value]} but then realise this is just going to get the index of the array and not the value.
I know you could do this in a {foreach/if} but that is going to get messy in the template. Is there a way to write a plugin for this?

Answer 1

Without foreach loop it can be done in one-liner:
{$field.options.labels[$field.value|array_search:$field.options.values]}
Or modifier:
function extractLabel($field){
$idx = array_search($field['value'], $field['options']['values']);
if($idx !== FALSE && isset($field['options']['labels'][$idx])){
return $field['options']['labels'][$idx];
}
}
$smarty->registerPlugin('modifier', 'extractLabel', 'extractLabel');
tpl:
{$field|extractLabel}