file_validate_is_image(FileInterface $file)
Checks that the file is recognized as a valid image.
Parameters
\Drupal\file\FileInterface $file: A file entity.
Return value
array An empty array if the file is a valid image or an array containing an error message if it's not.
See also
File
- core/modules/file/file.module, line 392
- Defines a "managed_file" Form API field and a "file" field for Field module.
Code
function file_validate_is_image(FileInterface $file) {
$errors = array();
$image_factory = \Drupal::service('image.factory');
$image = $image_factory->get($file->getFileUri());
if (!$image->isValid()) {
$supported_extensions = $image_factory->getSupportedExtensions();
$errors[] = t('Image type not supported. Allowed types: %types', array('%types' => implode(' ', $supported_extensions)));
}
return $errors;
}
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