I have a feeling the answer is \"it\'s not possible,\" but thought I\'d ask to satisfy my curiosity.
I have some code that\'s echoed where the \\n is unavoidable:
I don't know how to do a backspace, but if you are just trying to do a new line I would use:
echo "";
PHP code allows for html code as long as it is used in a print or echo statement and is inside double quotes.