<?php
$str = '#TEST string "quoted part\\" witch escape" other "quoted string"';
echo $res;
PD9waHAKCiRzdHIgPSAnI1RFU1Qgc3RyaW5nICJxdW90ZWQgcGFydFxcIiB3aXRjaCBlc2NhcGUiIG90aGVyICJxdW90ZWQgc3RyaW5nIic7CiRyZXMgPSBwcmVnX3JlcGxhY2UoJy8oPzwhXFxcXClbXCciXS8nLCAnJywgJHN0cik7CmVjaG8gJHJlczs=