static void tidy_object_free_storage(void * TSRMLS_DC);
static zend_object_value tidy_object_new_node(zend_class_entry * TSRMLS_DC);
static zend_object_value tidy_object_new_doc(zend_class_entry * TSRMLS_DC);
-static zend_class_entry *tidy_get_ce_node(zval * TSRMLS_DC);
-static zend_class_entry *tidy_get_ce_doc(zval * TSRMLS_DC);
+static zend_class_entry *tidy_get_ce_node(const zval * TSRMLS_DC);
+static zend_class_entry *tidy_get_ce_doc(const zval * TSRMLS_DC);
static zval * tidy_instanciate(zend_class_entry *, zval * TSRMLS_DC);
static int tidy_doc_cast_handler(zval *, zval *, int TSRMLS_DC);
static int tidy_node_cast_handler(zval *, zval *, int TSRMLS_DC);