How to wrap line in post in php

How to wrap the post in php? How to wrap the value taken out from php in the text!

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The problem code is as follows:

<?php
$str=$_POST[&#39;name1&#39;].&#39;-&#39;.$_POST[&#39;phone1&#39;].&#39;-&#39;.$_POST[&#39;address&#39;].&#39;-&#39;.$_POST[&#39;express&#39;];
echo $str."<br>";
$fp=fopen("b.txt","a+");
fwrite($fp,$str);//写入
fclose($fp);//关闭
?>

Solution:

$str=$_POST['name1'].'-'.$_POST['phone1'].'-'.$_POST['address'].'-'.$_POST['express']."\r\n";

Just add "\r\n" after it. This is the line break character of the text.

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