Returns the node type base of the passed node or node type string.
The base indicates which module implements this node type and is used to execute node-type-specific hooks. For types defined in the user interface and managed by node.module, the base is 'node_content'.
string $type: A string that indicates the node type to return.
string|false The node type base or FALSE if the node type is not found.
function node_type_get_base($type) {
$types = _node_types_build()->types;
return isset($types[$type]) && isset($types[$type]->base) ? $types[$type]->base : FALSE;
}