I'm creating an "image generator" where users can upload an image and add text and/or draw on it. The outputted image is a fixed size (698x450).

On the client side, when the user uploads their image it is set as the background of a div that's 698x450 with background-size:cover. This makes it fill the area nicely.

The final combined image is generated by PHP using GD functions. My question is, how can I get the image to scale in PHP the same way it does in CSS. I want the result of the PHP script to look the same as if the image was set in CSS as it was above. Does anyone know how browsers using background-size:cover calculate how to scale the image appropriately? I want to translate this into PHP.

Thanks

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