.-.-.-.-.-

<?php

declare(strict_types=1);

namespace PhpMyAdmin\Controllers\Database;

use PhpMyAdmin\Database\MultiTableQuery;
use PhpMyAdmin\DatabaseInterface;
use PhpMyAdmin\Response;
use PhpMyAdmin\Template;

/**
 * Handles database multi-table querying
 */
class MultiTableQueryController extends AbstractController
{
    /** @var DatabaseInterface */
    private $dbi;

/**
     * @param Response          $response
     * @param string            $db       Database name.
     * @param DatabaseInterface $dbi
     */
    public function __construct($response, Template $template, $db, $dbi)
    {
        parent::__construct($response, $template, $db);
        $this->dbi = $dbi;
    }

public function index(): void
    {
        $this->addScriptFiles([
            'vendor/jquery/jquery.md5.js',
            'database/multi_table_query.js',
            'database/query_generator.js',
        ]);

$queryInstance = new MultiTableQuery($this->dbi, $this->template, $this->db);

$this->response->addHTML($queryInstance->getFormHtml());
    }

public function displayResults(): void
    {
        global $PMA_Theme;

$params = [
            'sql_query' => $_POST['sql_query'],
            'db' => $_POST['db'] ?? $_GET['db'] ?? null,
        ];

$this->response->addHTML(MultiTableQuery::displayResults(
            $params['sql_query'],
            $params['db'],
            $PMA_Theme->getImgPath()
        ));
    }

public function table(): void
    {
        $params = [
            'tables' => $_GET['tables'],
            'db' => $_GET['db'] ?? null,
        ];
        $constrains = $this->dbi->getForeignKeyConstrains(
            $params['db'],
            $params['tables']
        );
        $this->response->addJSON(['foreignKeyConstrains' => $constrains]);
    }
}

/var/www/phpmyadmin/libraries/classes/Controllers/Database/MultiTableQueryController.php