Get first item or last item in an array

$arrays = [1,2,3,4,5];
$first  = reset($arrays);
$last   = end($arrays);
foreach( $arrays as $array )
{
    if ( $first == $array )
    {
        echo "<li>{$array} first</li>";
    }
    else if ( $last == $array )
    {
        echo "<li>{$array} last</li>";
    }
    else
    {
        echo "<li>{$array}</li>";
    }
}