Find YAML by key and change the value - symfony

Question

I want to parse the contents of any .yml file and modify any key.
Let's take the security.yml file, get its contents and use Yaml::parse, which will return an array of arrays with its structure.
$yml='/config/security.yml';
$path = $this->get('kernel')->getRootDir().$yml;
$contents= Yaml::parse(file_get_contents($file));
This outputs
array(1) {
["security"]=>
array(5) {
["encoders"]=>
string(8) "Array(1)"
["role_hierarchy"]=>
string(8) "Array(3)"
["providers"]=>
string(8) "Array(2)"
["firewalls"]=>
string(8) "Array(2)"
["access_control"]=>
string(9) "Array(14)"
}
}
So far so good. Now let's say I want to change the value of security.firewalls.main.pattern. I need to change the array value $contents['security']['firewalls']['main']['pattern'] and then file_put_contents the yaml dump.
My question is how to get and set a parameter value, dynamically, by any key and not hard-code it like above. The Yaml parser doesn't have any way to get a value by its key. I need a way to transform security.firewalls.main.pattern into array keys, somehow. I will delete the cache afterwards, obviously.
I made something in the meanwhile:
$array = Yaml::parse(file_get_contents($file));
$keys=array("security","firewalls","main");
$val = $this->parseYmlArray($array, $keys);
public function parseYmlArray($array, $keys)
{
$newArr = $array;
foreach ($keys as $key) {
$newArr = $newArr[$key];
}
return $newArr;
}
This will return whatever node, but it needs an array in the exact order of the keys depth.
I was thinking initially if I could make a ParameterBag just like the one in the Container. The problem is that I can't seem to find where it is created from an associative array in depth to one like key->value(security.firewalls.main.pattern and its value, for instance). If I try to create a ParameterBag out of an array, it doesn't modify that array, the bag contains the exact same array. I'm trying to find where the array is being parsed and transformed into the one in the container.

Answer 1

Actually, I don't see any alternative to update your configuration values directly.
But, you can achieve this by defining parameters.
For example, you can change your security.firewalls.main.pattern like follows:
parameters:
firewall_main_pattern: ^/yourpattern
# ...
firewalls:
# ...
main:
pattern: %firewall_main_pattern%
# ...
Then, update the parameter as needed:
$this->container->setParameter('firewall_main_pattern', '^/yournewpattern');
Hope this solves to your problem.
Update
In the same kind of your parseYmlArray, you can use the following to change a value :
function assignConfigurationValueByPath(&$array, $path, $value) {
$keys = explode('.', $path);
while ($key = array_shift($keys)) {
$arr = &$arr[$key];
}
$arr = $value;
}
$array = Yaml::parse(file_get_contents($file));
assignConfigurationValueByPath($array, 'security.firewalls.main.pattern, 'new_value');
Now $array is changed to:
array(
'security' => array(
// ...
'firewalls' => array(
// ...
'main' => array(
// ...
'pattern' => 'new_value'
),
),
),
):