<?php
$string = "Test \r\n Test";
$value = str_replace(PHP_EOL
, 'NewLineCharacter', $string); ?>
PD9waHAKJHN0cmluZyA9ICJUZXN0IFxyXG4gVGVzdCI7CiR2YWx1ZSA9IHN0cl9yZXBsYWNlKFBIUF9FT0wsICdOZXdMaW5lQ2hhcmFjdGVyJywgJHN0cmluZyk7CmVjaG8ganNvbl9lbmNvZGUoJHZhbHVlKTsKPz4K