Determine the permissions for one or more roles.

Parameters

$roles: An array whose keys are the role IDs of interest, such as $user->roles.

Return value

If $roles is a non-empty array, an array indexed by role ID is returned. Each value is an array whose keys are the permission strings for the given role ID. If $roles is empty nothing is returned.

File

modules/user/user.module, line 749

Enables the user registration and login system.

Code

function user_role_permissions($roles = array()) {
  $cache = &drupal_static(__FUNCTION__, array());

  $role_permissions = $fetch = array();

  if ($roles) {
    foreach ($roles as $rid => $name) {
      if (isset($cache [$rid])) {
        $role_permissions [$rid] = $cache [$rid];
      }
      else {
        // Add this rid to the list of those needing to be fetched.
        $fetch [] = $rid;
        // Prepare in case no permissions are returned.
        $cache [$rid] = array();
      }
    }

    if ($fetch) {
      // Get from the database permissions that were not in the static variable.
      // Only role IDs with at least one permission assigned will return rows.
      $result = db_query("SELECT rid, permission FROM {role_permission} WHERE rid IN (:fetch)", array(':fetch' => $fetch));

      foreach ($result as $row) {
        $cache [$row->rid][$row->permission] = TRUE;
      }
      foreach ($fetch as $rid) {
        // For every rid, we know we at least assigned an empty array.
        $role_permissions [$rid] = $cache [$rid];
      }
    }
  }

  return $role_permissions;
}