Php why "\n" not new line

Newline in php

<?php
 echo nl2br("If you want that '\n' works. \n Then use nl2br() function!");
 echo "<br> can also be used.";
 echo "nl2br() is in-built function whereas <br> is html tag";
?>

Php new line

return nl2br("This is the cointracker sample text.\nThis should be line 2!");

Php why "\n" not new line

if "test\n" not return, new line
  1st solution:echo "test".PHP_EOL;
  2nd solution:<?php header('Content-type: text/plain'); ?>
  3rd solution:"<br />" instead of "\n" or "\r\n"

Source: stackoverflow.com

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