PHP text style implementation code that retains multiple spaces and line breaks

The function of blocking sensitive words when users submit forms. The sensitive words come from ciku.txt under the same path on the server side. The sensitive words are connected through "|", such as "g|c|a". When submitting the form, the sensitive words are replaced. More importantly, the username in the form text field needs to be maintained. Enter multiple spaces and newline styles and output them as they are. The php code is as follows:

');
  $message=preg_replace($pattern, $replace, $_POST['message']); 
  $cikuStr=file_get_contents('ciku.txt');
  $cikuArr=explode('|',$cikuStr);
  $liuyan=str_replace($cikuArr, "**",$message);
  echo '您的留言是：
'.$liuyan;
}
?>

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The screenshot of the effect is as follows:

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