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Editing: Arr.php

<?php

namespace TailwindMerge\Support;

class Arr
{
    /**
     * @param  array<array-key, mixed>  $array
     * @return array<int, mixed>
     */
    public static function flatten(array $array, int $depth = PHP_INT_MAX): array
    {
        $result = [];

foreach ($array as $item) {
            $item = $item instanceof Collection ? $item->all() : $item;

if (! is_array($item)) {
                $result[] = $item;
            } else {
                $values = $depth === 1
                    ? array_values($item)
                    : static::flatten($item, $depth - 1);

foreach ($values as $value) {
                    $result[] = $value;
                }
            }
        }

return $result;
    }

/**
     * @template TKey
     * @template TValue
     * @template TMapWithKeysKey of array-key
     * @template TMapWithKeysValue
     *
     * @param  array<TKey, TValue>  $array
     * @param  callable(TValue, TKey): array<TMapWithKeysKey, TMapWithKeysValue>  $callback
     * @return array<TMapWithKeysKey, TMapWithKeysValue>
     */
    public static function mapWithKeys(array $array, callable $callback): array
    {
        $result = [];

foreach ($array as $key => $value) {
            $assoc = $callback($value, $key);

foreach ($assoc as $mapKey => $mapValue) {
                $result[$mapKey] = $mapValue;
            }
        }

return $result;
    }

/**
     * @template TKey
     * @template TValue
     * @template TMapValue
     *
     * @param  array<TKey, TValue>  $array
     * @param  callable(TValue, TKey): TMapValue  $callback
     * @return array<TKey, TMapValue>
     */
    public static function map(array $array, callable $callback): array
    {
        $keys = array_keys($array);

$items = array_map($callback, $array, $keys);

return array_combine($keys, $items);
    }

/**
     * @template TKey
     * @template TValue
     *
     * @param  array<TKey, TValue>  $array
     * @param  callable(TValue, TKey): bool  $callback
     * @return ?TValue
     */
    public static function first(array $array, callable $callback): mixed
    {
        foreach ($array as $key => $value) {
            if ($callback($value, $key)) {
                return $value;
            }
        }

return null;
    }
}

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