Use line breaks in PHP code and (\ n or \ r \ n and BR) applications

The browser does not recognize \ \ r \ n, the two line breaks are text newline characters, text files are valid, if you need to output to the browser or print to the display, the code used BR; If you just wrap in the source code, use \ n or \ r \ n, interested friends can understand, Maybe it's helpful for you to learn PHP.

Code A:

Copy the Code code as follows:

<?php echo ' hello</br> '; Echo ' world! '; ?> Output:helllo world!

Code B:

Copy the Code code as follows:

<?php echo ' hello\n ';//unix system uses the \n;windows system \ r \ n echo ' world! '; ?> output:helloworld!

Analysis : The browser does not recognize \ \ r \ n, these two line breaks are text newline characters, text files are valid; Viewing HTML source code in a Web page can find code B successfully implemented newline
Summary : If you need to output the results to a browser or print to a display, use </br>; in code if you just wrap in the source code, use \ n or \ r \ n