PHP Laravel Convert array value to upper case

The Str::upper method converts the given string to uppercase:

use Illuminate\Support\Str;

$string = Str::upper('laravel');

If you're getting data from DB by using Eloquent, you could create an accessor

public function getProvince($value)
{
    return strtoupper($value);
}

If not, you could change it manually:

for ($i = 0; $i < count($data); $i++) {
    $data[$i]['province'] = strtoupper($data[$i]['province']);
}

$collection is the array of objects, then try to use this way :

$collection = collect($array);

$keyed = $collection->keyBy(function ($item) {
    return strtoupper($item['province']);
});

$keyed->all();

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