i want to convert input string into array using laravel “request” API

i want to convert input field data into array via using laravel request API

<?php

use IlluminateHttpRequest;

class someclass{
function $function( request $request)
{
// input text = car-bus-truck
$GetIncomingFeildInArray = expolde('-', $request->name(array_search('en', $request->lang)));  

print_r($GetIncomingFeildInArray);

//output should be like this , array( [0]=>'car', [1]=>'bus', [2]=> 'truck')

}
}
?>