Php wrong value - php

Question

I am using the following code. I take some values from an xml, then I use as html option. I am using almost the same code for the first and second select. First option show in the select menu the right values: http://vilavaleaprahovei.ro/kimea/anvelope.php, but the other one shows 0. Could somebody to tell me what to do on the "Eficienta combustibil" to show the right values?
<form action="anvelope.php" method="post">
<?php
$jante = "http://vilavaleaprahovei.ro/kimea/feeds/alcarRO_feed.xml";
$xml=simplexml_load_file($jante);
$items = [];
$limitItems = 0;
foreach($xml->Produs as $child)
{
$marca = (string)$child->Marca;
if(!isset($items[$marca])) {
$items[$marca] = [];
}
$items[$marca]['sarcina'][] = (int)$child->Sarcina;
$items[$marca]['eficienta_combustibil'][] = (float)$child->Eficienta_Combustibil;
}
//SARCINA
$option_arr9 = array_column($items,'sarcina');
function generate_option9($item, $key)
{
echo "<option value='" . $item . "'>" . $item . "</option>";
}
$options = array_unique($option_arr9[0], SORT_STRING); // You can add array_unique and SORT_NUMERIC here
asort($options);
echo "<select name='sarcina'><option>Sarcina</option>";
array_walk_recursive($options, 'generate_option9');
echo "</select>";
//EFICIENTA COMBUSTIBIL
$option_arr10 = array_column($items,'eficienta_combustibil');
function generate_option10($item, $key)
{
echo "<option value='" . $item . "'>" . $item . "</option>";
}
$options = array_unique($option_arr10[3], SORT_STRING); // You can add array_unique and SORT_NUMERIC here
asort($options);
echo "<select name='eficienta_combustibil'><option>Eficienta Combustibil</option>";
array_walk_recursive($options, 'generate_option10');
echo "</select>";
?>
</form>