vendor/illuminate/database/Connectors/Connector.php

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<?php

namespace Illuminate\Database\Connectors;

use PDO;
use Exception;
use Throwable;
use Doctrine\DBAL\Driver\PDOConnection;
use Illuminate\Database\DetectsLostConnections;

class Connector
{
    use DetectsLostConnections;

    /**
     * The default PDO connection options.
     *
     * @var array
     */
    protected $options = [
        PDO::ATTR_CASE => PDO::CASE_NATURAL,
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_ORACLE_NULLS => PDO::NULL_NATURAL,
        PDO::ATTR_STRINGIFY_FETCHES => false,
        PDO::ATTR_EMULATE_PREPARES => false,
    ];

    /**
     * Create a new PDO connection.
     *
     * @param  string  $dsn
     * @param  array   $config
     * @param  array   $options
     * @return \PDO
     *
     * @throws \Exception
     */
    public function createConnection($dsn, array $config, array $options)
    {
        [$username, $password] = [
            $config['username'] ?? null, $config['password'] ?? null,
        ];

        try {
            return $this->createPdoConnection(
                $dsn, $username, $password, $options
            );
        } catch (Exception $e) {
            return $this->tryAgainIfCausedByLostConnection(
                $e, $dsn, $username, $password, $options
            );
        }
    }

    /**
     * Create a new PDO connection instance.
     *
     * @param  string  $dsn
     * @param  string  $username
     * @param  string  $password