public function __construct($dir)
{
if (self::$useDirectories === NULL) {
// checks whether directory is writable
$uniq = uniqid('_', TRUE);
umask(00);
if (!@mkdir("{$dir}/{$uniq}", 0777)) {
// @ - is escalated to exception
throw new InvalidStateException("Unable to write to directory '{$dir}'. Make this directory writable.");
}
// tests subdirectory mode
self::$useDirectories = !ini_get('safe_mode');
if (!self::$useDirectories && @file_put_contents("{$dir}/{$uniq}/_", '') !== FALSE) {
// @ - error is expected
self::$useDirectories = TRUE;
unlink("{$dir}/{$uniq}/_");
}
rmdir("{$dir}/{$uniq}");
}
$this->dir = $dir;
$this->useDirs = (bool) self::$useDirectories;
if (mt_rand() / mt_getrandmax() < self::$gcProbability) {
$this->clean(array());
}
}
