PHP save picture, how to solve

PHP Save Picture
I use Jpgraph to generate the canvas, enter the canvas, but the picture can not be saved successfully, run the program does not have error prompts.
Draw a line chart with PHP
Include ("e:/phpser/appserv/jpgraph/jpgraph/jpgraph.php");
Include ("e:/phpser/appserv/jpgraph/jpgraph/jpgraph_line.php");
$datay = $pm 25;
$graph = new Graph (700,300, "Auto"); Build Canvas
$graph->img->setmargin (50,40,30,40); Set the margins of the canvas
$graph->img->setantialiasing (); Set the smoothing state of the stitches
$graph->setscale ("Textlin"); Set scale style
$graph->setshadow ();//Create a canvas shadow
$graph->title->set ("Changes in PM2.5 value in the last 24 hours");//Set Caption
$graph->title->setfont (ff_simsun,fs_bold);//Set Title font
$graph->setmargincolor ("LightBlue");//Set the background color of the canvas to be light blue
$graph->yaxis->title->setfont (ff_simsun,fs_bold);//Set the font for the y-axis title
$graph->xaxis->setpos ("min");
$graph->yaxis->hidezerolabel ();
$graph->ygrid->setfill (True,[email protected] ', [email protected] ');
$graph->xaxis->setticklabels ($a);
$graph->xaxis->setfont (Ff_simsun); Set the font for the X axis
$graph->yscale->setgrace (20);
$p 1 = new LinePlot ($datay); Create a Line chart object
$p 1->mark->settype (mark_filledcircle); Set data coordinate points as graphical markers
$p 1->mark->setfillcolor ("Red"); Set the color of the fill
$p 1->mark->setwidth (4); Set the diameter of the cylindrical marker to 4 pixels
$p 1->mark->setcolor ("Blue"); Set the stitch color to Blue
$p 1->setcenter (); Draw stitches at the center of each coordinate point on the x-axis
[color= #FF0000] $graph->add ($p 1); Draw a polyline on a chart
$graph->stroke (); Output image
$graph->stroke (' c:/appserv/www/pm25/1.jpg ');
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You
$graph->stroke (); Output image
Do you have a picture displayed?
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Do not understand Ah, in learning, refueling it!!
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What are the error hints?
is the path to the saved picture writable?

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No error, not equal to no error
You can only trace it and see what's wrong.

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