- array_map: documentation ( source)
- var_dump: documentation ( source)
- array_merge: documentation ( source)
- array_unique: documentation ( source)
<?php
$main_category_currency = 1;
$children = array(
array('id_category'=>10),
array('id_category'=>15),
);
$categories = array_unique(array_merge(
array($main_category_currency),
array_map(
function($child)
{
return $child['id_category'];
},
$children
)
), SORT_NUMERIC);
var_dump($categories);