/**
* Splits a collection into sets, grouped by the result of running each value through callback. If callback is a string
* instead of a function, groups by the property named by callback on each of the values.
*
* @param array $collection
* @param callable|string $callback
*
* @return array
* @author Aurimas Niekis <*****@*****.**>
*/
function collection_group_by($collection, $callback)
{
$result = [];
foreach ($collection as $key => $value) {
if (is_callable($callback)) {
$groupName = call_user_func($callback, $value);
} else {
$groupName = $value[$callback];
}
$result[$groupName] = collection_get($result, $groupName, []);
$result[$groupName][$key] = $value;
}
return $result;
}
/**
* Extract single property from array of arrays
*
* @param array $collection
* @param string $key
*
* @return array
* @author Aurimas Niekis <*****@*****.**>
*/
function collection_pluck($collection, $key)
{
return array_map(function ($item) use($key) {
return collection_get($item, $key);
}, $collection);
}
