Fehlenden Schlüssel in Array an richtiger Position einfügen

<?php
$default = [
    'März'      => '0',
    'April'     => '0',
    'Mai'       => '0',
    'Juni'      => '0',
    'Juli'      => '0',
    'August'    => '0',
    'September' => '0',
    'Oktober'   => '0',
    'November'  => '0',
    'Dezember'  => '0'
];

$set = [
    'März'      => '25',
    'April'     => '2',
    'Mai'       => '5',
    'Juni'      => '35',
    'Juli'      => '21',
    'August'    => '42',
    'September' => '36',
    // November fehlt
    'Oktober'   => '54',
    'Dezember'  => '25'
];

$result = array_merge(
    $default,$set
);


print_r( $result );

Ausgabe

Array

(
    [März] => 25
    [April] => 2
    [Mai] => 5
    [Juni] => 35
    [Juli] => 21
    [August] => 42
    [September] => 36
    [Oktober] => 54
    [November] => 0
    [Dezember] => 25
)