This example demonstrates creating a stacked bar chart, completed with bar labels and legend box. The key features in this example are:

• Add a legend to the chart using BaseChart.addLegend.
  
  
• Add a title to the y-axis using Axis.setTitle, and draw the title upright using TextBox.setFontAngle (the default for y-axis is to draw the title rotated by 90 degrees). Note the y-axis title can contain multiple lines by including the line break character.
  
  
• Add a stacked bar layer using XYChart.addBarLayer2 with the Stack pre-defined constant.
  
  
• Add multiple data sets to the bar layer using Layer.addDataSet.
  
  
• Include labels for the whole bar using Layer.setAggregateLabelStyle.
  
  
• Include labels for the bar segments within a stacked bar using Layer.setDataLabelStyle.

For bar labels, Layer.setDataLabelStyle and Layer.setAggregateLabelStyle control the styles (fonts, colors, backgrounds, etc), while Layer.setDataLabelFormat and Layer.setAggregateLabelFormat control the formats (the contents of the label, number of decimal points in numbers, etc). You may also add custom labels to the bars using Layer.addCustomDataLabel and Layer.addCustomAggregateLabel.

[File: phpdemo/stackedbar.php".]

<?php require_once("../lib/phpchartdir.php"); #The data for the bar chart $data0 = array(100, 125, 245, 147, 67); $data1 = array(85, 156, 179, 211, 123); $data2 = array(97, 87, 56, 267, 157); #The labels for the bar chart $labels = array("Mon", "Tue", "Wed", "Thu", "Fri"); #Create a XYChart object of size 500 x 320 pixels $c = new XYChart(500, 320); #Set the plotarea at (100, 40) and of size 280 x 240 pixels $c->setPlotArea(100, 40, 280, 240); #Add a legend box at (400, 100) $c->addLegend(400, 100); #Add a title to the chart using 14 points Times Bold Itatic font $c->addTitle("Weekday Network Load", "timesbi.ttf", 14); #Add a title to the y axis. Draw the title upright (font angle = 0) $titleObj = $c->yAxis->setTitle("Average\nWorkload\n(MBytes\nPer Hour)"); $titleObj->setFontAngle(0); #Set the labels on the x axis $c->xAxis->setLabels($labels); #Add a stacked bar layer and set the layer 3D depth to 8 pixels $layer = $c->addBarLayer2(Stack, 8); #Add the three data sets to the bar layer $layer->addDataSet($data0, 0xff8080, "Server # 1"); $layer->addDataSet($data1, 0x80ff80, "Server # 2"); $layer->addDataSet($data2, 0x8080ff, "Server # 3"); #Enable bar label for the whole bar $layer->setAggregateLabelStyle(); #Enable bar label for each segment of the stacked bar $layer->setDataLabelStyle(); #output the chart header("Content-type: image/png"); print($c->makeChart2(PNG)); ?>