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.
$uri: A URI or pathname.
$context: Refer to http://php.net/manual/ref.stream.php
Boolean TRUE on success, or FALSE on failure.
unlink()
function drupal_unlink($uri, $context = NULL) {
$scheme = file_uri_scheme($uri);
if ((!$scheme || !file_stream_wrapper_valid_scheme($scheme)) && substr(PHP_OS, 0, 3) == 'WIN') {
chmod($uri, 0600);
}
if ($context) {
return unlink($uri, $context);
}
else {
return unlink($uri);
}
}