Acl\Adapter\Utility\PhpAro::addRole PHP Method

    public function addRole(array $aro)
    {
        foreach ($aro as $role => $inheritedRoles) {
            if (!isset($this->_tree[$role])) {
                $this->_tree[$role] = [];
            }
            if (!empty($inheritedRoles)) {
                if (is_string($inheritedRoles)) {
                    $inheritedRoles = array_map('trim', explode(',', $inheritedRoles));
                }
                foreach ($inheritedRoles as $dependency) {
                    // detect cycles
                    $roles = $this->roles($dependency);
                    if (in_array($role, Hash::flatten($roles))) {
                        $path = '';
                        foreach ($roles as $roleDependencies) {
                            $path .= implode('|', (array) $roleDependencies) . ' -> ';
                        }
                        trigger_error(sprintf('cycle detected when inheriting %s from %s. Path: %s', $role, $dependency, $path . $role));
                        continue;
                    }
                    if (!isset($this->_tree[$dependency])) {
                        $this->_tree[$dependency] = [];
                    }
                    $this->_tree[$dependency][] = $role;
                }
            }
        }
    }