Determine whether the user has a given privilege.
$string: The permission, such as "administer nodes", being checked for.
\Drupal\Core\Session\AccountInterface $account: (optional) The account to check, if not given use currently logged in user.
Boolean TRUE if the current user has the requested permission.
All permission checks in Drupal should go through this function. This way, we guarantee consistent behavior, and ensure that the superuser can perform all actions.
function user_access($string, AccountInterface $account = NULL) {
global $user;
if (!isset($account)) {
$account = $user;
}
// Make sure we are working with the BC decorator.
$account = $account instanceof User ? $account
->getBCEntity() : $account;
// User #1 has all privileges:
if ($account->uid == 1) {
return TRUE;
}
// To reduce the number of SQL queries, we cache the user's permissions
// in a static variable.
// Use the advanced drupal_static() pattern, since this is called very often.
static $drupal_static_fast;
if (!isset($drupal_static_fast)) {
$drupal_static_fast['perm'] =& drupal_static(__FUNCTION__);
}
$perm =& $drupal_static_fast['perm'];
if (!isset($perm[$account->uid])) {
$role_permissions = user_role_permissions($account
->getRoles());
$perms = array();
foreach ($role_permissions as $one_role) {
$perms += $one_role;
}
$perm[$account->uid] = $perms;
}
return isset($perm[$account->uid][$string]);
}