file_validate_extensions(FileInterface $file, $extensions)
Checks that the filename ends with an allowed extension.
Parameters
\Drupal\file\FileInterface $file: A file entity.
string $extensions: A string with a space separated list of allowed extensions.
Return value
array An empty array if the file extension is allowed or an array containing an error message if it's not.
See also
File
- core/modules/file/file.module, line 336
- Defines a "managed_file" Form API field and a "file" field for Field module.
Code
function file_validate_extensions(FileInterface $file, $extensions) {
$errors = array();
$regex = '/\.(' . preg_replace('/ +/', '|', preg_quote($extensions)) . ')$/i';
if (!preg_match($regex, $file->getFilename())) {
$errors[] = t('Only files with the following extensions are allowed: %files-allowed.', array('%files-allowed' => $extensions));
}
return $errors;
}
Please login to continue.