gistfile1.php

<?php
namespace Services\Mivir;

class Thumbnailer
{
    public function thumbnailify($path, $width, $height)
    {
        if ( ! file_exists($path)) {
            throw new \Exception('The file to thumbnailify does not exist.');
        }

        $image = imagecreatefromstring(file_get_contents($path));
        $image = $this->cutToAspectRatio($image, ($width/$height));
        $image = $this->resize($image, $width, $height);

        return $image;
    }

    protected function cutToAspectRatio($res, $hRatio)
    {
        $origWidth = imagesx($res);
        $origHeight = imagesy($res);

        $vRatio = 1 / $hRatio;

        $width = $origWidth;
        $height = $vRatio * $origWidth;

        if ($height > $origHeight) {
            $height = $origHeight;
            $width = $hRatio * $height;
        }

        $dest = imagecreatetruecolor($width, $height);
        imagecopy($dest, $res, 0, 0, 0, 0, $width, $height);

        return $dest;
    }

    protected function resize($res, $width, $height)
    {
        $dest = imagecreatetruecolor($width, $height);
        imagecopyresized($dest, $res, 0, 0, 0, 0, $width, $height, imagesx($res), imagesy($res));

        return $dest;
    }
}