ErrorException (/var/www/projects/tracks/index.php:47): session_set_save_handler(): Providing individual callbacks instead of an object implementing SessionHandlerInterface is deprecated

Array
(
    [0] => Array
        (
            [function] => {closure:/var/www/projects/tracks/index.php:38}
        )

    [1] => Array
        (
            [file] => /var/www/projects/tracks/index.php
            [line] => 47
            [function] => session_set_save_handler
        )

)