Contao\CoreBundle\Image\LegacyResizer::resize PHP Method

    public function resize(ImageInterface $image, ResizeConfigurationInterface $config, ResizeOptionsInterface $options)
    {
        if (!empty($GLOBALS['TL_HOOKS']['executeResize']) && is_array($GLOBALS['TL_HOOKS']['executeResize']) || !empty($GLOBALS['TL_HOOKS']['getImage']) && is_array($GLOBALS['TL_HOOKS']['getImage'])) {
            @trigger_error('Using the executeResize and getImage hooks has been deprecated and will no longer work in Contao 5.0. Replace the contao.image.resizer service instead.', E_USER_DEPRECATED);
            $this->legacyImage = null;
            $legacyPath = $image->getPath();
            if (0 === strpos($legacyPath, TL_ROOT . '/') || 0 === strpos($legacyPath, TL_ROOT . '\\')) {
                $legacyPath = substr($legacyPath, strlen(TL_ROOT) + 1);
                $this->legacyImage = new LegacyImage(new File($legacyPath));
                $this->legacyImage->setTargetWidth($config->getWidth());
                $this->legacyImage->setTargetHeight($config->getHeight());
                $this->legacyImage->setResizeMode($config->getMode());
                $this->legacyImage->setZoomLevel($config->getZoomLevel());
                if ($options->getTargetPath() && (0 === strpos($options->getTargetPath(), TL_ROOT . '/') || 0 === strpos($options->getTargetPath(), TL_ROOT . '\\'))) {
                    $this->legacyImage->setTargetPath(substr($options->getTargetPath(), strlen(TL_ROOT) + 1));
                }
                $importantPart = $image->getImportantPart();
                $this->legacyImage->setImportantPart(['x' => $importantPart->getPosition()->getX(), 'y' => $importantPart->getPosition()->getY(), 'width' => $importantPart->getSize()->getWidth(), 'height' => $importantPart->getSize()->getHeight()]);
            }
        }
        if (isset($GLOBALS['TL_HOOKS']['executeResize']) && is_array($GLOBALS['TL_HOOKS']['executeResize']) && $this->legacyImage) {
            foreach ($GLOBALS['TL_HOOKS']['executeResize'] as $callback) {
                $return = System::importStatic($callback[0])->{$callback[1]}($this->legacyImage);
                if (is_string($return)) {
                    return $this->createImage($image, TL_ROOT . '/' . $return);
                }
            }
        }
        return parent::resize($image, $config, $options);
    }