Zend/zend_object_handlers.c


@@ -26,6 +26,7 @@
 #include "zend_objects_API.h"
 #include "zend_object_handlers.h"
 #include "zend_interfaces.h"
+#include "zend_collection.h"
 #include "zend_exceptions.h"
…

@@ -1042,6 +1045,8 @@ ZEND_API void zend_std_write_dimension(zend_object *object, zval *offset, zval *
                zend_call_known_instance_method_with_2_params(funcs->zf_offsetset, object, NULL, &tmp_offset, value);
                OBJ_RELEASE(object);
                zval_ptr_dtor(&tmp_offset);
+       } else if (zend_class_implements_interface(ce, zend_ce_collection)) {
+               zend_collection_add_item(object, offset, value);
        } else {
                zend_bad_array_access(ce);
        }

Zend/zend_collection.h


@@ -34,6 +34,11 @@ void zend_collection_add_interfaces(zend_class_entry *ce);
 void zend_collection_register_handlers(zend_class_entry *ce);
 void zend_collection_register_props(zend_class_entry *ce);

+void zend_collection_add_item(zend_object *object, zval *offset, zval *value);