Symfony içinde parametreler nasıl atanır

# app/config/parameters.yml
parameters:
    string: one
    array_1: one two
    array_2: [one two]
    array_3: [one: two]
    array_4: {one two}
    array_5: {one: two}
    array_6:
        name: one
        year: two
    array_7:
        - one
        - two
    array_8:
        dim_1:
            - one
            - two
        dim_2:
            - one
            - two

echo '<pre>';                                                    
                                                                         
echo $this->container->getParameter('string'); echo PHP_EOL;     
print_r($this->container->getParameter('array_1')); echo PHP_EOL;
print_r($this->container->getParameter('array_2')); echo PHP_EOL;
print_r($this->container->getParameter('array_3')); echo PHP_EOL;
print_r($this->container->getParameter('array_4')); echo PHP_EOL;
print_r($this->container->getParameter('array_5')); echo PHP_EOL;
print_r($this->container->getParameter('array_6')); echo PHP_EOL;
print_r($this->container->getParameter('array_7')); echo PHP_EOL;
print_r($this->container->getParameter('array_8')); echo PHP_EOL;

exit;

one

one two

Array
(
    [0] => one two
)

Array
(
    [0] => Array
        (
            [one] => two
        )
)

Array
(
    [one] => two
)

Array
(
    [one] => two
)

Array
(
    [name] => one
    [year] => two
)

Array
(
    [0] => one
    [1] => two
)

Array
(
    [dim_1] => Array
        (
            [0] => one
            [1] => two
        )

    [dim_2] => Array
        (
            [0] => one
            [1] => two
        )
)