Application of line breaks and (\n or \r\n and br) in php code

The browser cannot recognize \n or \r\n. These two line breaks are text line breaks and the text file is valid; if you need to output the results to the browser or print to the monitor, use br in the code; if it is just For line breaks in the source code, use \n or \r\n. Friends who are interested can learn more. It may be helpful for you to learn php

Code a:

Copy code The code is as follows:

<?php 
echo&#39;hello</br>&#39;; 
echo&#39;world!&#39;; 
?> 

output: 
helllo 
world!

Code b:

Copy code The code is as follows:

<?php 
echo&#39;hello\n&#39;;//unix系统使用\n；windows系统下\r\n 
echo&#39;world!&#39;; 
?> 

output: 
helloworld!

Analysis : The browser cannot recognize \n or \r\n. These two line breaks are text line breaks, and the text file is valid; viewing the HTML source code in the web page, you can find that code b successfully implements line breaks
Summary: If you need to output the results to the browser or print to the monitor, use
; if you just want to wrap the line in the source code, use \n or \r\n

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