Yet another library based on gd to resize images with method chaining.
require_once ('vendor/autoload.php');
use Root4root\ImgResize\ImgResize;
$image = new ImgResize('pathToImage.jpg');
$image->resampleToHeight(500)
->sharpen()
->save('pathToSave.gif');
$watermark = new ImgResize('pathToWatermark.png');
$image->addImage(new ImgResize('anotherImage.png'))
->joinVertical()
->watermark($watermark)
->save('pathToSave.jpg');
$image->watermark($watermark)->save('pathToSave2.jpg');Every time you modify image, ImgResize returns new instanse of self as a result. So you could assign instance to a variable at any moment, which will stay immutable. Be careful with saving instances due to the memory limit, though.
$imageWithWatermark = (new ImgResize('pathToImage.jpg'))->watermark(new ImgResize('pathToWater.png'));
$imageWithWatermark->resampleToRectangle(500,500)->save('path.jpg'); //Fits image to rectangle by height or width - which is bigger.
$imageWithWatermark->resampleToWidth(1000)->sharpen()->save('path.png'); //Still one resample - best quality