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I'm seeking a way to rasterize (that is convert to a raster of bits) HTML commands. My belief is that I'd do this by directing the HTML to an off-screen window or port, and then asking to get back a JPEG or other image format of the bits of that window. This is done often in Windows. How does one do this in PHP?
You'd need more than just PHP, you'd need a high level glue (possibly OS scripting) language that could run a browser and extract output from it. PHP really only generates HTML, it can generate images but only from a simplistic gd api. Alternatively you write a browser in PHP