SetBrowserCache — Control browser-side image caching
$plot->SetBrowserCache($browser_cache
)
SetBrowserCache
controls whether to allow the browser
to cache the image generated by PHPlot.
By default, PHPlot sends out HTTP headers to tell the browser not to cache
the generated image, since it is assumed that the image is generated from
dynamic data and a cached copy would not be accurate. You can use this
function to allow the browser to cache the image.