PHP report jpgraph histogram example code

Novices who are new to jpgraph will definitely encounter various problems, such as garbled characters. This case is produced by jpgraph3.0.7. After many experiments by myself, the garbled problem has been solved.
Copy the code. The code is as follows:
$datay=array(); //vertical coordinate data
$datax=array(); //abscissa data
foreach ($usernums as $key => $value){
$datay[] = $value ;
$datax[] = $userids[$key];
}
require_once ('jpgraph-3.0.7/jpgraph/jpgraph.php');
require_once ('jpgraph-3.0.7/jpgraph/jpgraph_bar.php' );
// Create the graph. These two calls are always required
$graph = new Graph(800,600); //Image height and width
$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);
// Add a drop shadow
$graph->SetShadow();
/ / Adjust the margin a bit to make more room for titles
$graph->img->SetMargin(40,30,20,40);
// Create a bar pot
$bplot = new BarPlot($datay) ;
// Adjust fill color
$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);
/ / Setup the titles
$graph->title->Set(iconv(“UTF-8″, “gb2312″,”User consumption report graph”));
$graph->xaxis->title-> ;Set(iconv(“UTF-8″, “gb2312″,”user name”));
$graph->yaxis->title->Set(iconv(“UTF-8″, “gb2312″, "User order quantity"));
$graph->xaxis->title->SetFont(FF_SIMSUN,FS_BOLD);
$graph->yaxis->title->SetFont(FF_SIMSUN,FS_BOLD);
$graph->title->SetFont(FF_SIMSUN,FS_BOLD);
// Display the graph
$graph->Stroke();
?>