jpgraph cache问题，错误提示25113 jpg-config.inc.php配置如下：define('USE_CACHE',TRUE);define('READ_CACHE',true);define('CACHE_DIR','C:/Program Files/www/oa/ywtj/tmp/jpgraph_cache/');
脚本如下：
include ("../Examples/jpgraph/jpgraph.php");include ("../Examples/jpgraph/jpgraph_bar.php");$datay=array(1,2,3,4);//纵坐标数据$datax=array(a,b,c,d);//横坐标数据foreach ($usernums as $key => $value){$datay[] = $value;$datax[] = $userids[$key];}$graph = new Graph(800,600,'auto',1); //********缓存时间为1分钟************$graph->SetScale("textlin");$graph->xaxis->SetTickLabels($datax);$graph->xaxis->SetFont(FF_VERDANA,FS_NORMAL,10);$graph->xaxis->SetLabelAngle(30);$graph->yaxis->scale->SetGrace(20);$graph->xaxis->scale->SetGrace(20);$graph->SetShadow();$graph->img->SetMargin(40,30,20,40);$bplot = new BarPlot($datay);$bplot->SetFillColor('orange');$bplot->value->Show();$bplot->value->SetFont(FF_ARIAL,FS_BOLD,10);$bplot->value->SetAngle(45);$bplot->value->SetFormat('%d');$graph->Add($bplot);$graph->title->Set("光缆利用率统计表");$graph->xaxis->title->Set("经营部名称");$graph->yaxis->title->Set("经营部占用情况");$graph->xaxis->title->SetFont(FF_SIMSUN,FS_BOLD);$graph->yaxis->title->SetFont(FF_SIMSUN,FS_BOLD);$graph->title->SetFont(FF_SIMSUN,FS_BOLD);$graph->Stroke();第一次访问时，cache文件夹内生成一个copy图片，第2次访问时，生成的copy图片字节为0，第3次访问时就出现错误提示
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------解决方案--------------------无法删除缓存图像？
文件名都是空的，如何能删除？
这个玩意很不稳定嘛，慎用