I needed a way to check the currect user has permission to view the currect/particular page, Searched lot finally got the exact way, going to show the tricks to you in this blog.
Drupal has an api called " drupal_valid_path " , Normally it used to test the url is valid or not. but the trick is that, It also check the user has permission to view the currect/particular page.
It will return TRUE If path is valid and user has permission to view the page, otherwise it will return FALSE,
For example,
$path = current_path();
if (drupal_valid_path($path)) {
// Your code here.
}