public ImageToolkitInterface::save($destination)
Writes an image resource to a destination file.
string $destination: A string file URI or path where the image should be saved.
bool TRUE on success, FALSE on failure.
public function save($destination);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!ImageToolkit!ImageToolkitInterface.php/function/ImageToolkitInterface::save/8.1.x