File::getImageSize() 

\nn\t3::File()->getImageSize($filename = ''); 

get imagesize for file.

\nn\t3::File()->getImageSize( 'yellowstone.jpg' );
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| @return array

Source Code 

public function getImageSize($filename = '')
{
	if (!file_exists($filename)) return [];
	$imageinfo = getimagesize($filename);
	return [
		'width' => $imageinfo[0],
		'height' => $imageinfo[1],
		'mime' => $imageinfo['mime'],
	];
}
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