In a recent discussion about the MS terra server it was mentioned
this could not be done with PHP because the terraserver 

" has special front-end code that allows images to be passed by reference, 
so the image data goes directly from the database access back end to the 
client browser, without having to be copied to and from an intermediate 
middleware layer."

The implication is that the 'middle layer' (PHP) would slow things down
to an unusable state. so, when I extract an image from the database and 
echo it to a webpage, is there any copying done? or is it a direct stream to the 
webpage?

Kind regards
Kevin

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Kevin Waterson
Port Macquarie, Australia

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