/**
* Static method that creates a unique filename whose name begins with
* $prefix and ends with $suffix in the directory $directory. $directory
* is a reference to a File Object.
* Then, the file is locked for exclusive reading/writing.
*
* @author manuel holtgrewe, grin@gmx.net
* @throws IOException
* @access public
*/
public function createTempFile(string $prefix, string $suffix, File $directory)
{
// quick but efficient hack to create a unique filename ;-)
$result = null;
do {
$result = new File($directory, $prefix . substr(md5(time()), 0, 8) . $suffix);
} while (file_exists($result->getPath()->toNative()));
self::$fs->createNewFile($result->getPath()->toNative());
self::$fs->lock($result);
return $result;
}
/**
* Unlocks a file and throws an IO Error if this is not possible.
*
* @throws Exception
* @return void
*/
public function unlock(File $f)
{
$filename = $f->getPath()->toNative();
$fp = @fopen($filename, "w");
$result = @flock($fp, LOCK_UN);
fclose($fp);
if (!$result) {
throw new Exception("Could not unlock file '{$filename}'");
}
}