vendor/illuminate/database/DatabaseManager.php

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<?php

namespace Illuminate\Database;

use PDO;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;
use InvalidArgumentException;
use Illuminate\Support\ConfigurationUrlParser;
use Illuminate\Database\Connectors\ConnectionFactory;

/**
 * @mixin \Illuminate\Database\Connection
 */
class DatabaseManager implements ConnectionResolverInterface
{
    /**
     * The application instance.
     *
     * @var \Illuminate\Contracts\Foundation\Application
     */
    protected $app;

    /**
     * The database connection factory instance.
     *
     * @var \Illuminate\Database\Connectors\ConnectionFactory
     */
    protected $factory;

    /**
     * The active connection instances.
     *
     * @var array
     */
    protected $connections = [];

    /**
     * The custom connection resolvers.
     *
     * @var array
     */
    protected $extensions = [];

    /**
     * The callback to be executed to reconnect to a database.
     *
     * @var callable
     */
    protected $reconnector;

    /**
     * Create a new database manager instance.
     *
     * @param  \Illuminate\Contracts\Foundation\Application  $app
     * @param  \Illuminate\Database\Connectors\ConnectionFactory  $factory
     * @return void
     */
    public function __construct($app, ConnectionFactory $factory)
    {