You can not specify the "new line" character in a single-quoted string. If you don't believe, try this script:

<?php

echo ' will not work in single quoted strings.';

?>

This script will print:

will not work in single quoted strings.

How Many Escape Sequences Are Recognized in Single-Quoted Strings?

There are 2 escape sequences you can use in single-quoted strings:

► - Represents the back slash character.

► ' - Represents the single quote character.