[11.x] Correct how base options for missing config files are preloaded

[u01jmg3]

Issue introduced by PR #51619 and present since Laravel 11.10

---

Offending code

framework/src/Illuminate/Foundation/Bootstrap/LoadConfiguration.php

Lines 71 to 75 in c0955af

	foreach (array_diff(array_keys($base), array_keys($files)) as $name => $config) {
	$repository->set($name, $config);
	}

Given the config

$baseArrayKeys	$filesArrayKeys
[ 'app', 'auth', 'broadcasting', 'cache', 'concurrency', 'cors', 'database', 'filesystems', 'hashing', 'logging', 'mail', 'queue', 'services', 'session', 'view', ];	[ 'app', 'broadcasting', 'cache', 'custom', 'database', 'filesystems', 'logging', 'mail', 'queue', ];

You get

// array_diff(array_keys($base), array_keys($files)

$keysArrayDiff = [
    1 => 'auth',
    4 => 'concurrency',
    5 => 'cors',
    8 => 'hashing',
    12 => 'services',
    13 => 'session',
    14 => 'view',
];

• This means you're setting a config item with $name = 1 and $config = 'auth', etc. which isn't the intention.
• Test added to demo the issue/fix

Instead switch to

+use Illuminate\Support\Collection;

-foreach (array_diff(array_keys($base), array_keys($files)) as $name => $config) {
+foreach (Collection::make($base)->diffKeys($files) as $name => $config) {
    $repository->set($name, $config);
}

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