php-meminfo: Objects that are still in memory but not shown by php-meminfo

I tried using php-meminfo in finding out why in a specific case PDO connections were being kept open. PDO connections only close when they end up out of scope without a refcount so I kinda knew where to look.

After addressing some issues ( https://github.com/BitOne/php-meminfo/pull/62 ) and even adding a little object store dumper to this extension (see paste below) I noticed that even though php-meminfo wasn’t showing me these instances, they were still actively in memory.

This problem occured in a Laravel+Laravel Doctrine project. I suspect that these PDO instances might be referenced in closures somewhere? But maybe they’re referenced in a different call stack? Is there any way we could have php-meminfo actually find references to these objects somehow?

Attachment, overly simple object_store_dump():

PHP_FUNCTION(object_store_dump)
{
        zend_object **obj_ptr, **end, *obj;

        if (EG(objects_store).top <= 1) {
                return;
        }

        end = EG(objects_store).object_buckets + 1;
        obj_ptr = EG(objects_store).object_buckets + EG(objects_store).top;

        do {
                obj_ptr--;
                obj = *obj_ptr;

                if (IS_OBJ_VALID(obj)) {
                        php_printf("object: %s: %d\n", obj->ce->name->val, obj->handle );

                        if (!(GC_FLAGS(obj) & IS_OBJ_DESTRUCTOR_CALLED)) {
                                php_printf("- DESTRUCTOR NOT CALLED\n");
                        }

                        if (!(GC_FLAGS(obj) & IS_OBJ_FREE_CALLED)) {
                                php_printf("- FREE NOT CALLED\n");
                        }

                }
        } while (obj_ptr != end);
}