vendor/illuminate/database/Connectors/ConnectionFactory.php

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<?php

namespace Illuminate\Database\Connectors;

use PDOException;
use Illuminate\Support\Arr;
use InvalidArgumentException;
use Illuminate\Database\Connection;
use Illuminate\Database\MySqlConnection;
use Illuminate\Database\SQLiteConnection;
use Illuminate\Database\PostgresConnection;
use Illuminate\Database\SqlServerConnection;
use Illuminate\Contracts\Container\Container;

class ConnectionFactory
{
    /**
     * The IoC container instance.
     *
     * @var \Illuminate\Contracts\Container\Container
     */
    protected $container;

    /**
     * Create a new connection factory instance.
     *
     * @param  \Illuminate\Contracts\Container\Container  $container
     * @return void
     */
    public function __construct(Container $container)
    {
        $this->container = $container;
    }

    /**
     * Establish a PDO connection based on the configuration.
     *
     * @param  array   $config
     * @param  string|null  $name
     * @return \Illuminate\Database\Connection
     */
    public function make(array $config, $name = null)
    {
        $config = $this->parseConfig($config, $name);

        if (isset($config['read'])) {
            return $this->createReadWriteConnection($config);
        }

        return $this->createSingleConnection($config);
    }

    /**
     * Parse and prepare the database configuration.
     *
     * @param  array   $config
     * @param  string  $name
     * @return array
     */
    protected function parseConfig(array $config, $name)