struct php_stream_filter_ops

typedef struct _php_stream_filter_ops {
            php_stream_filter_status_t (*filter)(
                    php_stream *stream,
                    php_stream_filter *thisfilter,
                    php_stream_bucket_brigade *buckets_in,
                    php_stream_bucket_brigade *buckets_out,
                    size_t *bytes_consumed,
                    int flags
                    TSRMLS_DC);

            void (*dtor)(php_stream_filter *thisfilter TSRMLS_DC);

            const char *label;
} php_stream_filter_ops;