PHP: is there a way to see “invisible” characters like \n

Question

Is there a way to see invisible characters like whitespace, newlines, and other non-printing characters in a manner like print_r() ?

Reason is there is some sort of

Answer 1

You can use the addcslashes function:

string addcslashes ( string $str, string $charlist )

which will return a string with backslashes before characters. An example would be: