(PHP 8)
imagegetinterpolation — Get the interpolation method
imagegetinterpolation ( GdImage $image ) : int
Gets the currently set interpolation method of the image
.
image
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
Returns the interpolation method.
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https://www.php.net/manual/en/function.imagegetinterpolation.php