This is a squared line plot, which is similar to a line plot but the points are connected with steps.
Example 5.13. Squared Plot
<?php # PHPlot Example: squared plot require_once 'phplot.php'; # To get repeatable results with 'random' data: srand(1); # Make some noisy data: $data = array(); for ($i = 0; $i < 100; $i++) $data[] = array('', $i / 4.0 + 2.0 + rand(-20, 20) / 10.0); $plot = new PHPlot(800, 600); $plot->SetImageBorderType('plain'); $plot->SetPlotType('squared'); $plot->SetDataType('text-data'); $plot->SetDataValues($data); $plot->SetTitle('Noisy Data (squared plot)'); # Make the lines a bit wider: $plot->SetLineWidths(2); # Turn on the X grid (Y grid is on by default): $plot->SetDrawXGrid(True); # Use exactly this data range: $plot->SetPlotAreaWorld(0, 0, 100, 40); $plot->DrawGraph();