public function _var_export()
{
$arguments = func_get_args();
foreach ($arguments as $index => $value) {
if ($value instanceof self) {
unset($arguments[$index]);
//hide PHPSandbox variable
} else {
if ($value instanceof SandboxedString) {
$arguments[$index] = strval($value);
}
}
}
return call_user_func_array('var_export', $arguments);
}