FIXED: I'm getting an error whilst trying to graph my PHP data - Official support forum

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RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 18 years old) and has a wealth of features making it an ideal choice to use for showing charts on your website.

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Version 7.11 (released in March 2026) is the latest version of RGraph and contains just a few updates to the code which you can see on the changelog page. There's a new dumbbell variation for the Bar and Horizontal bar charts (both SVG and canvas) and the front page layout of the website has been tweaked.

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I'm getting an error whilst trying to graph my PHP data

     <canvas id="cvs" width="600" height="250">[No canvas support]</canvas>
     <script>
        chart = new RGraph.Line({
            id: 'cvs',
            data: <?php print($data_string) ?>,
            options: {
                marginLeft: 35,
                marginRight: 5,
                marginInner: 10,
                tickmarksStyle: 'endcircle',
                xaxisLabels: <?php print($labels_string) ?>
            }
        }).draw()
    </script>

Uncaught SyntaxError: Unexpected token '<'
Error spec.: data: <?php print($data_string) ?>,

Well that error would seem to suggest that PHP isn't being parsed on your server.

Try viewing the source in your browser and if you see this:

data: <?php print($data_string) ?>

Then it would suggest that PHP isn't being parsed (because PHP should be replacing that on the server before the HTML is sent to your browser).

What you should be seeing is something like this:

data: [5,6,8,4,3,5,6],

Which is valid JavaScript.