If you want to print special characters like \r\n, you must use double quote, single quotes won’t work.

$name = 'Rex';

echo 'I am $name \r\n Lo';
// I am $name \r\n Lo

echo "I am $name \r\n Lo";
// I am Rex
//  Lo

 

Reference:

1. https://php.net/manual/en/language.types.string.php
2. https://stackoverflow.com/questions/7890217/making-a-new-line-with-single-quotes