提醒它的原因是什么

  $file_path = "test.txt";
  if (file_exists($file_path))
  
  {
  	$fp=fopen($file_path, "a+");
  	$con=fread($fp, filesize($file_path));
  	echo $con;
  }else 
  {
  	echo "文件不存在";
  }
  fclose($fp);
?>

  $file_path = "test.txt";

  $con=file_get_contents($file_path);
  $con=str_replace("\r\n","
",$con);
  echo $con;
?>