How to wrap lines when writing html in php

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:

'; echo'world!'; ?> output: helllo world!

Code b:

 output: helloworld!

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

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