Replace multiple newlines, tabs, and spaces

Question

I want to replace multiple newline characters with one newline character, and multiple spaces with a single space.

I tried preg_replace(\"/\\n\\n+/\", \"\\n\",

Answer 1

I would suggest something like this:

preg_replace("/(\R){2,}/", "$1", $str);

This will take care of all the Unicode newline characters.