laravel collection flatMap
$collection = collect([
['name' => 'Sally'],
['school' => 'Arkansas'],
['age' => 28]
]);
$flattened = $collection->flatMap(function ($values) {
return array_map('strtoupper', $values);
});
$flattened->all();
// ['name' => 'SALLY', 'school' => 'ARKANSAS', 'age' => '28'];
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