Sanity check for when a stream is requested to be persistent but the wrapper

does not respect the flag.

main/streams/streams.c

@@ -1461,6 +1461,15 @@ PHPAPI php_stream *_php_stream_open_wrapper_ex(char *path, char *mode, int optio
 		stream = wrapper->wops->stream_opener(wrapper,
 				path_to_open, mode, options ^ REPORT_ERRORS,
 				opened_path, context STREAMS_REL_CC TSRMLS_CC);
+	
+		/* if the caller asked for a persistent stream but the wrapper did not
+		 * return one, force an error here */
+		if (stream && (options & STREAM_OPEN_PERSISTENT) && !stream->is_persistent) {
+			php_stream_wrapper_log_error(wrapper, options ^ REPORT_ERRORS TSRMLS_CC,
+					"wrapper does not support persistent streams");
+			php_stream_close(stream);
+			stream = NULL;
+		}
 		
 		if (stream) {
 			stream->wrapper = wrapper;