ZF2 convert all request data to an array from a controller

requestData.php

function getRequestData()
{
    if( empty($this->request) )
        $this->request  = $this->getRequest();

    $post     = $this->request->getPost()->toArray();
    $get      = $this->request->getQuery()->toArray();
    $headers  = $this->request->getHeaders()->toArray();
    $body     = $this->request->getContent() !== ''
               ? json_decode($this->request->getContent(), true)
               : [];

    return array_merge($headers, $get, $post, $body);
}