# Check the overall structure of a frame. Return True if OK, else False.
# Frame needs: boundary, content type and content length, then the image.
# This does nothing with the image (there is another test for that).
function check_frame($frame, $boundary)
{
global $mime_type;
return preg_match("--{$boundary}\\s", $frame) && preg_match("Content-Type: {$mime_type}\\si", $frame) && preg_match("Content-Length: (\\d*)\\si", $frame);
}
# Initial plot object setup:
$plot = new PHPlot_pv(640, 480);
$plot->SetDataType('text-data');
$plot->SetPlotType('lines');
$plot->SetFileFormat('jpg');
$plot->SetXTickLabelPos('none');
$plot->SetXTickPos('none');
$plot->SetXDataLabelPos('none');
$plot->SetPlotAreaWorld(NULL, 0, NULL, 10);
$plot->SetPrintImage(False);
# StartStream does no output, only headers (which we cannot catch using the
# CLI), so just check the variables it sets:
$plot->StartStream();
$boundary = $plot->GET_stream_boundary();
# Check: Stream frame header includes content-type with expected MIME type
$sfh = $plot->GET_stream_frame_header();
if (!preg_match("Content-Type: {$mime_type}", $sfh)) {
fwrite(STDERR, "Error: Did not match Content type in header:\n{$sfh}\n");
$errors++;
}
$plot->SetDataValues($data1);
$plot->DrawGraph();
ob_start();