public Image::getSource()
Retrieves the source path of the image file.
string The source path of the image file. An empty string if the source is not set.
Overrides ImageInterface::getSource
public function getSource() { return $this->source; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Image!Image.php/function/Image::getSource/8.1.x