abstract public FileTransfer::isFile($path)
Checks if a particular path is a file (not a directory).
string $path: The path to check.
bool TRUE if the specified path is a file, FALSE otherwise.
abstract public function isFile($path);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!FileTransfer!FileTransfer.php/function/FileTransfer::isFile/8.1.x