How to get image size from a canvas?

问题

Is it possible to get the image size in pixels from a canvas?

E.g. I know I can achieve it getting the size from the image directly:

list($width, $height) = @getimagesize($_FILES['inputFieldName']['tmp_name'])

but I want to get it from a canvas. E.g.:

$canvas = imagecreatefromjpeg($image_path);
//Get image size from $canvas

回答1:

Try:

$canvas = imagecreatefromjpeg($image_path);
$width = imagesx($canvas);
$height = imagesy($canvas);

Details at http://es1.php.net/manual/en/function.imagesx.php and http://es1.php.net/manual/en/function.imagesy.php

来源：https://stackoverflow.com/questions/20519172/how-to-get-image-size-from-a-canvas