What does the function nl2br in PHP do? code example

Example 1: nl2br php

because each OS have different ASCII chars for linebreak:
windows = \r\n
unix = \n
mac = \r
  
<?php
echo nl2br("foo isn't\n bar");
?>

Example 2: nl2br() php

// add to the functions file
function translateLineBreaks($string) {
	$result = nl2br ($string);
  	return $result;
}