struct php_stream_wrapper

struct _php_stream_wrapper  {
            php_stream_wrapper_ops *wops;   /* operations the wrapper can perform */
            void *abstract;                 /* context for the wrapper */
            int is_url;                     /* so that PG(allow_url_fopen) can be respected */

            /* support for wrappers to return (multiple) error messages to the stream opener */
            int err_count;
            char **err_stack;
         } php_stream_wrapper;