(PECL rrd >= 0.9.0)
RRDGraph::saveVerbose — Saves the RRD database query into image and returns the verbose information about generated graph
Saves the RRD database query into image file defined by method RRDGraph::__construct() and returns the verbose information about generated graph, if "-" is used as image filename, image data are also returned in result array.
此函数没有参数。
Returns array with detailed information about generated image, 或者在失败时返回 false.