This seems to resolve the issues with fgets.

I've moved EOF detection into the streams layer; a stream reader
implementation should set stream->eof when it detects EOF.
Fixed test for user streams - it still fails but that is due to an output
buffering bug.

main/php_streams.h

@@ -269,6 +269,8 @@ struct _php_stream  {
 	/* how much data to read when filling buffer */
 	size_t chunk_size;
 
+	int eof;
+
 }; /* php_stream */
 /* state definitions when closing down; these are private to streams.c */
 #define PHP_STREAM_FCLOSE_NONE 0