Symfony Session:
Array
(
    [y] => 20
)

PHP Session:
Array
(
    [_sf2_attributes] => Array
        (
            [y] => 20
        )

    [_symfony_flashes] => Array
        (
        )

    [_sf2_meta] => Array
        (
            [u] => 1762257047
            [c] => 1762257047
            [l] => 0
        )

    [x] => 42
)

Hello bob - refresh the page to increment x and y

Warning: PHP Request Shutdown: Write failed: No space left on device (28) in Unknown on line 0

Warning: PHP Request Shutdown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php/sessions) in Unknown on line 0