Master PHP library for operating pictures

<?php
namespace ImageOptimizer\TypeGuesser;
class ExtensionTypeGuesser implements TypeGuesser
    public function guess($filepath)
    {
        $ext = strtolower(pathinfo($filepath, PATHINFO_EXTENSION));
        switch($ext) {
            case 'png':
                return self::TYPE_PNG;
            case 'gif':
                return self::TYPE_GIF;
            case 'jpg':
            case 'jpeg':
                return self::TYPE_JPEG;
            default:
                return self::TYPE_UNKNOWN;
        }
    }
}

Manipulate images: remove unnecessary colors, pixels, etc., for example, change the image from large to small. The requirement for web images is to publish images of the highest possible quality in the shortest possible transmission time. Therefore, when designing and processing web page images, it is required that the images have the highest possible resolution and the smallest possible size, so that the download speed of the images can be the fastest. To do this, the image must be optimized.