Best place for additional functions in Laravel 5 - laravel

Question

I would like to know what is the best place to put additional functions in order to use it in a controller. Here is an example:
public function store(CreateServiceRequest $request)
{
function getMonth($value)
{
if ($value == 1)
{
return 1;
} else
if ($value == 2)
{
return 3;
} else
if ($value == 3)
{
return 6;
} else
return 0;
}
function getYear($value)
{
if ($value == 4)
{
return 1;
} else
if ($value == 5)
{
return 2;
} else
if ($value == 6)
{
return 3;
} else
return 0;
}
function getTax($price, $vat)
{
$tax = ($vat/100*$price);
return $tax;
}
$input = Request::all();
$months = getMonth($input['period']);
$years = getYear($input['period']);
$tax = getTax($input['price_net'], $input['vat']);
$input['price_vat'] = $tax;
$input['price_gross'] = $input['price_net'] + $tax;
$input['period_end'] = Carbon::createFromFormat('Y-m-d', $input['period_start'])->addYears($years)->addMonths($months)->toDateString();
return $input;
}
As you can see inside the store method I wrote three functions:
getMonth, getYear and getTax. The method first fetch all request, then I need to create some new variables - for instance I get the $input['period'] and use it to make $input['period_end']. So I don't change $input['period'] value but create a new $input['period_end']. If I would only change existing variable I used mutator... So the question is where I should put the code of getMonth, getYear and getTax functions? It seems like a mess in store method...

Answer 1

make helpers.php (in root, where .env file is).
if (! function_exists('helper_function')) {
function helper_function()
{
return 'hello';
}
}
and in your composer.json autoload it:
"autoload": {
"psr-4": {
"App\\": "app/"
},
"files": [
"helpers.php"
]
},
now you are able to call your helper function everywhere in code base