Method createThumbs

/**
 * Method to create thumbnails from the current image and save them to disk. It allows creation by resizing or cropping the original image.
 *
 * @param   mixed    $thumbSizes      string or array of strings. Example: $thumbSizes = array('150x75','250x150');
 * @param   integer  $creationMethod  1-3 resize $scaleMethod | 4 create cropping
 * @param   string   $thumbsFolder    destination thumbs folder. null generates a thumbs folder in the image folder
 *
 * @return  array
 *
 * @since   2.5.0
 * @throws  \LogicException
 * @throws  \InvalidArgumentException
 */
public function createThumbs($thumbSizes, $creationMethod = self::SCALE_INSIDE, $thumbsFolder = null)
{
    // Make sure the resource handle is valid.
    if (!$this->isLoaded()) {
        throw new \LogicException('No valid image was loaded.');
    }
    // No thumbFolder set -> we will create a thumbs folder in the current image folder
    if (\is_null($thumbsFolder)) {
        $thumbsFolder = \dirname($this->getPath()) . '/thumbs';
    }
    // Check destination
    if (!is_dir($thumbsFolder) && (!is_dir(\dirname($thumbsFolder)) || !@mkdir($thumbsFolder))) {
        throw new \InvalidArgumentException('Folder does not exist and cannot be created: ' . $thumbsFolder);
    }
    // Process thumbs
    $thumbsCreated = [];
    if ($thumbs = $this->generateThumbs($thumbSizes, $creationMethod)) {
        // Parent image properties
        $imgProperties = static::getImageFileProperties($this->getPath());
        // Get image filename and extension.
        $pathInfo = pathinfo($this->getPath());
        $filename = $pathInfo['filename'];
        $fileExtension = $pathInfo['extension'] ?? '';
        foreach ($thumbs as $thumb) {
            // Get thumb properties
            $thumbWidth = $thumb->getWidth();
            $thumbHeight = $thumb->getHeight();
            // Generate thumb name
            $thumbFileName = $filename . '_' . $thumbWidth . 'x' . $thumbHeight . '.' . $fileExtension;
            // Save thumb file to disk
            $thumbFileName = $thumbsFolder . '/' . $thumbFileName;
            if ($thumb->toFile($thumbFileName, $imgProperties->type)) {
                // Return Image object with thumb path to ease further manipulation
                $thumb->path = $thumbFileName;
                $thumbsCreated[] = $thumb;
            }
        }
    }
    return $thumbsCreated;
}