还是不行大神们，救救小弟我吧

还是不行大神们，救救我吧
$DOCUMENT_ROOT = $_SERVER['DOCUMENT_ROOT'];
$date = date('H：i, js F Y');
?>

Sport

$outputstring =“nihao31456”
//open file for write
$fp = fopen("$DOCUMENT_ROOT/../orders/orders.txt",'a');
//flock($fp, LOCK_EX);
if (!$fp){
echo "

提交失败/strong>";
exit;


fwrit($fp, $outputstring, strlen($outputstring));
flock($fp, Lock_UN);
fclose($fp);

echo"OK^_^";
}
?>