How to write php newline statement code

The browser cannot recognize \n or \r\n. These two line breaks are text line breaks and are valid for text files. You can find the code b by viewing the HTML source code in the web page. Line wrapping was successfully achieved.

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Code a:

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

Code b:

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

Summary: If necessary To output the results to the browser or print to the monitor, use 0b9f73f8e206867bd1f5dc5957dbcb38 in the code; if you just wrap the line in the source code, use \n or \r\n.

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