A better way than a switch case

Question

I have a method that utilizes switch - case blocks similar to the below chunk of code:

    switch ($totalMonthsFromImmigration) {
        case $totalMonthsFromImmigration <= 18:
            $this->clauses->put('immigrant_1', $this->clauses->get('immigrant'));
            $this->clauses->put('immigrant_2', null);
            $this->clauses->put('immigrant_3', null);
            break;
        case $totalMonthsFromImmigration <= 30:
            $this->clauses->put('immigrant_1', null);
            $this->clauses->put('immigrant_2', $this->clauses->get('immigrant'));
            $this->clauses->put('immigrant_3', null);
            break;
        case $totalMonthsFromImmigration <= 42:
            $this->clauses->put('immigrant_1', null);
            $this->clauses->put('immigrant_2', null);
            $this->clauses->put('immigrant_3', $this->clauses->get('immigrant'));
            break;
    }

As it can be seen from the above example the cases make a similar things, and there's a little difference.

Is there a more elegant way to handle this situation? I don't really like the duplication of the code.

Answer 1

try to set default value then add value based on condition

$this->clauses->put('immigrant_1', null);
$this->clauses->put('immigrant_2', null);
$this->clauses->put('immigrant_3', null);

switch ($totalMonthsFromImmigration) {
            case $totalMonthsFromImmigration <= 18:
                $this->clauses->put('immigrant_1', $this->clauses->get('immigrant'));
                break;
            case $totalMonthsFromImmigration <= 30:
                $this->clauses->put('immigrant_2', $this->clauses->get('immigrant'));
                break;
            case $totalMonthsFromImmigration <= 42:
                $this->clauses->put('immigrant_3', $this->clauses->get('immigrant'));
                break;
 }