public FileSystemInterface::unlink($uri, $context = NULL)
Deletes a file.
PHP's unlink() is broken on Windows, as it can fail to remove a file when it has a read-only flag set.
string $uri: A URI or pathname.
resource $context: Refer to http://php.net/manual/ref.stream.php
bool Boolean TRUE on success, or FALSE on failure.
unlink()
public function unlink($uri, $context = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!File!FileSystemInterface.php/function/FileSystemInterface::unlink/8.1.x