PHPStan - Add Rule to ensure get_subscribed_events use one of the three possible syntax #7123
Description
We need to add a new custom rules to make sure that get_subscribed_events function is following one of the three possible syntax.
As a reminder, here is the docblock provided:
/**
* Returns an array of events that this subscriber wants to listen to.
*
* The array key is the event name. The value can be:
*
* * The method name
* * An array with the method name and priority
* * An array with the method name, priority and number of accepted arguments
*
* For instance:
*
* * array('hook_name' => 'method_name')
* * array('hook_name' => array('method_name', $priority))
* * array('hook_name' => array('method_name', $priority, $accepted_args))
* * array('hook_name' => array(array('method_name_1', $priority_1, $accepted_args_1)), array('method_name_2', $priority_2, $accepted_args_2)))
*
* @return array
*/