Description:
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Quote from manual for imagerotate(): "and the rotated image is scaled down so that the whole rotated image fits in the destination image"

The rotated image is in fact not scaled down, but the function returns an image with dimensions to fit the image (also, the reference to a destination image seems out of place, since no destination image is specified)

Reproduce code:
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$wrk = imagecreatetruecolor(100,100);
$wrk = imagerotate($wrk, 45, -1);
var_dump(imagesx($wrk), imagesy($wrk));

Expected result:
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int(100) int(100) 

Actual result:
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int(142) int(142)