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Editing: FlashMessages.php

<?php

declare(strict_types=1);

namespace PhpMyAdmin;

use RuntimeException;

use function __;

final class FlashMessages
{
    private const STORAGE_KEY = 'flashMessages';

/** @var array */
    private $storage;

/** @var array<string, string[]> */
    private $previousMessages = [];

public function __construct()
    {
        if (! isset($_SESSION)) {
            throw new RuntimeException(__('Session not found.'));
        }

$this->storage = &$_SESSION;

if (isset($this->storage[self::STORAGE_KEY])) {
            $this->previousMessages = $this->storage[self::STORAGE_KEY];
        }

$this->storage[self::STORAGE_KEY] = [];
    }

public function addMessage(string $key, string $message): void
    {
        if (! isset($this->storage[self::STORAGE_KEY][$key])) {
            $this->storage[self::STORAGE_KEY][$key] = [];
        }

$this->storage[self::STORAGE_KEY][$key][] = $message;
    }

/** @return string[]|null */
    public function getMessage(string $key): ?array
    {
        return $this->previousMessages[$key] ?? null;
    }

/** @return array<string, string[]> */
    public function getMessages(): array
    {
        return $this->previousMessages;
    }
}

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