JpGraph : no error but broken picture - php

Question

I make a graph with JPGraph but I've a little problem.
No error was displayed but the picture is a "broken picture".
Here is my code :
$graph = new Graph(1000,300);
$graph->img->SetMargin(40,30,50,40);
$graph->SetScale("textlin");
$graph->title->Set("Graph");
$graph->ygrid->Show();
$graph->ygrid->SetColor('blue#0.7');
$graph->ygrid->SetLineStyle('dashed');
$graph->xgrid->Show();
$graph->xgrid->SetColor('red#0.7');
$graph->xgrid->SetLineStyle('dashed');
$graph->title->SetFont(FF_ARIAL,FS_BOLD,11);
$bigCourbe = array();
$i = 0;
foreach($bigData as $data)
{
var_dump($data);
$courbe = new LinePlot($data);
$courbe->value->Show();
$courbe->value->SetFont(FF_ARIAL,FS_NORMAL,9);
$courbe->value->SetFormat('%d');
$courbe->mark->SetType(MARK_FILLEDCIRCLE);
$courbe->mark->SetFillColor("green");
$courbe->mark->SetWidth(2);
$courbe->SetWeight(10);
echo $function[$i];
$courbe->SetLegend($function[$i++]);
$bigCourbe[] = $courbe;
}
$graph->xaxis->title->Set("Heures");
$graph->yaxis->title->SetFont(FF_FONT1,FS_BOLD);
$graph->xaxis->title->SetFont(FF_FONT1,FS_BOLD);
foreach ($bigCourbe as $elem) {
$graph->Add($elem);
}
//$graph->Stroke();
So, the result seems good :
array (size=24)
0 => string '0.000' (length=5)
1 => string '0.000' (length=5)
2 => string '0.000' (length=5)
3 => string '0.000' (length=5)
4 => string '0.000' (length=5)
5 => string '0.000' (length=5)
....
Index HC <- it's the $function[$i] var
array (size=24)
0 => string '0.200' (length=5)
1 => string '0.200' (length=5)
2 => string '0.100' (length=5)
3 => string '0.200' (length=5)
4 => string '0.200' (length=5)
5 => string '0.200' (length=5)
....
Index HP
array (size=24)
0 => string '0.000' (length=5)
1 => string '0.000' (length=5)
2 => string '0.000' (length=5)
3 => string '0.000' (length=5)
4 => string '0.000' (length=5)
5 => string '0.000' (length=5)
Index HPTE
array (size=24)
0 => string '0.200' (length=5)
1 => string '0.200' (length=5)
2 => string '0.100' (length=5)
3 => string '0.200' (length=5)
4 => string '0.200' (length=5)
5 => string '0.200' (length=5)
....
Total Heure
I do not see the problem...
If I remove the debug, and uncomment the $graph->Stroke(); line. I have that :
Can you help me ?
Thank you in advance.

Answer 1

in my case (php 7.1.0) it was Deprecated message
just put
ini_set('display_errors', 0);
at the top of your script and try again.
or
comment out $graph->Stroke(); and see what error(or warning) you have

Answer 2

I know this is an old question but I just had the same problem and fixed it by removing everything before the <?php.
THis was suggested in the link below - check 1.b.
Solution Source

Answer 3

How do you display the graph? Do you have an HTML page? Please show the HTML code.
I have a similar problem where I have no error message, but get the broken image icon.
jpGraph can't include PHP file
One thing I would recommend is to add the lines
//save to file
$fileName = "/tmp/imagefile.png";
$graph->img->Stream($fileName);
if the image from the file is correct, then you can rule out the graph generating code.