php array combine – Education Career Blog

I have the next array:

Array
(
    0 => Array
        (
            id => 160
            payment_period => Monthly
            plan_payment_type_id => 171
            payment_type_id => 4
        )
    1 => Array
        (
            id => 160
            payment_period => Monthly
            plan_payment_type_id => 172
            payment_type_id => 5
        )
    2 => Array
        (
            id => 161
            payment_period => Weekly
            plan_payment_type_id => 173
            payment_type_id => 9
        )
)

I need to group this array by id. How can I do it in the best way?
My output should be:

Array
(
    0 => Array
        (
            id => 160
            payment_period => Monthly
            payment_types => Array(
                0 => Array(
                    plan_payment_type_id => 171
                    payment_type_id => 4
                )
                1 => Array(
                    plan_payment_type_id => 172
                    payment_type_id => 5
                )
            )
        )
    1 => Array
        (
            id => 161
            payment_period => Weekly
            payment_types => Array(
                0 => Array(
                    plan_payment_type_id => 173
                    payment_type_id => 9
                )
            )
        )
)

Thank you very much.

Something like this:

$output = array();
$id_array = array();
$i = 0;
foreach($input as $key=>$val) {
        if(array_key_exists($val'id',$id_array)) {
                $pos = $id_array$val'id';
                $output$pos'payment_types' = array('plan_payment_type_id'=> $val'plan_payment_type_id','payment_type_id' => $val'payment_type_id');
        } else {
                $output$i = array('id' => $val'id','payment_period' => $val'payment_period','payment_types' => array(array('plan_payment_type_id'=> $val'plan_payment_type_id','payment_type_id' => $val'payment_type_id')));
                echo "Adding ",$val'id',"\n";
                $id_array$val'id' = $i; 
                $i++;
        }   
}

Working link

You are stuck because you try to build an enumarated array, when you actually want to groups this by array id. Just use the “id” field as target index:

foreach ($in as $src) {
    extract($src);
    $output$id"id" = $id;
    $output$id"payment_period" = $payment_period;
    $output$id"payment_types" = array(
        "plan_payment_type_id" => $plan_payment_type_id,
        "payment_type_id" => $payment_type_id,
    );
}

Of course you can use lengthy $src variable names instead of the evil extract() shortcut.

Anyway, this method groups your output array by $id, but also retains the “id”=>$id internal key.