I have checked logic that $requirement_keys = array_keys($requirements); ret...

I have checked logic that $requirement_keys = array_keys($requirements); returns array along with key value format. And if we use $applicable_requirements = '_csrf_request_header_token'; as string then we have to use inArray function to check "_csrf_request_header_token" present or not. So instead of using inArray dunction we can use exisitng array_intersect function which is already used overthere.