public ImageToolkitInterface::getMimeType()
Returns the MIME type of the image file.
string The MIME type of the image file, or an empty string if the image is invalid.
public function getMimeType();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!ImageToolkit!ImageToolkitInterface.php/function/ImageToolkitInterface::getMimeType/8.1.x