After being combined to form a thin film, but the film will be shaped, how to have the object-fit:cover effect of css?

I have set the imagecreatetruecolor to be 300x300
, but I have set it to (400,300).
I forced it to be 200
, but the film produced by me will be flattened (because the original temperature is 300, I set it to 200, so it will be flattened)
how to achieve the object-fit:cover effect of css
and then add it to the cloth?

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Yes, you can do this with php's gd function library. The main functions used are creating canvas imagecreate class function, copying function imagecopy and imagecopyresampled, coloring function imagecolorallocate, keeping transparent imagecolortransparent

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