Laravel / PDO Database Connection Error Fix - Package Out of Order

'mysql' => array(
    'driver'    => 'mysql',
    'host'      => 'localhost',
    'database'  => 'database',
    'username'  => 'root',
    'password'  => '',
    'charset'   => 'utf8',
    'collation' => 'utf8_unicode_ci',
    'prefix'    => '',
    'options'   => array(
        PDO::ATTR_PERSISTENT => true,
    ),
),

http://fideloper.com/laravel-pdo-connection-options

Also, you need to increase the connection limit of unix sockets

echo 1024 > /proc/sys/net/core/somaxconn

https://tweaked.io/guide/kernel/