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Editing: UniqueController.php

<?php

declare(strict_types=1);

namespace PhpMyAdmin\Controllers\Table\Structure;

use PhpMyAdmin\Controllers\Table\AbstractController;
use PhpMyAdmin\Controllers\Table\StructureController;
use PhpMyAdmin\DatabaseInterface;
use PhpMyAdmin\Message;
use PhpMyAdmin\ResponseRenderer;
use PhpMyAdmin\Template;
use PhpMyAdmin\Util;

use function __;
use function count;

final class UniqueController extends AbstractController
{
    /** @var DatabaseInterface */
    private $dbi;

/** @var StructureController */
    private $structureController;

public function __construct(
        ResponseRenderer $response,
        Template $template,
        string $db,
        string $table,
        DatabaseInterface $dbi,
        StructureController $structureController
    ) {
        parent::__construct($response, $template, $db, $table);
        $this->dbi = $dbi;
        $this->structureController = $structureController;
    }

public function __invoke(): void
    {
        global $sql_query, $db, $table, $message;

$selected = $_POST['selected_fld'] ?? [];

if (empty($selected)) {
            $this->response->setRequestStatus(false);
            $this->response->addJSON('message', __('No column selected.'));

return;
        }

$i = 1;
        $selectedCount = count($selected);
        $sql_query = 'ALTER TABLE ' . Util::backquote($table) . ' ADD UNIQUE(';

foreach ($selected as $field) {
            $sql_query .= Util::backquote($field);
            $sql_query .= $i++ === $selectedCount ? ');' : ', ';
        }

$this->dbi->selectDb($db);
        $result = $this->dbi->tryQuery($sql_query);

if (! $result) {
            $message = Message::error($this->dbi->getError());
        }

if (empty($message)) {
            $message = Message::success();
        }

($this->structureController)();
    }
}

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