Manager/FileManager.php
public function saveImageToPng($gdResource, $path = null, $filename = null)
    {
        if (null === $path) {
            $path = $this->basePath;
        }

        $this->ensureDirectoryExists($path);

        if (null === $filename) {
            $filename = md5(uniqid('imagepng', true)) . '.png';
        }

        $fullPath = $path . '/' . $filename;
        $result = imagepng($gdResource, $fullPath, 5);

        if (!$result) {
            throw new \RuntimeException(sprintf('Could not save image to %s', $fullPath));
        }

        $file = new File($fullPath, $filename, 'image/png', filesize($fullPath));

        return $file;
    }
public function saveImageToPng($gdResource, $path = null, $filename = null)
    {
        if (null === $path) {
            $path = $this->basePath;
        }

        $this->ensureDirectoryExists($path);

        if (null === $filename) {
            $filename = md5(uniqid('imagepng', true)) . '.png';
        }

        $fullPath = $path . '/' . $filename;
        $result = imagepng($gdResource, $fullPath, 5);

        if (!$result) {
            throw new \RuntimeException(sprintf('Could not save image to %s', $fullPath));
        }

        $file = new File($fullPath, $filename, 'image/png', filesize($fullPath));

        return $file;
    }
@param resource $gdResource  A GD image resource
@param string $path          The path (no filename) to save the image
@param string $filename      The filename to save the image as

@throws \RuntimeException
@return \Orkestra\Bundle\ApplicationBundle\Entity\File