PHP multiple new lines

Question

I\'m a little stuck. How do I remove multiple newlines which are in a row with one newline. There could be anything up to 20 newlines next to each other. For example

Answer 1

Improving on Marc B's answer:

$fixed_text  = preg_replace("\n(\s*\n)+", "\n", $text_to_fix);

Which should match an initial newline, then at least one of a group of any amount of whitespace followed by a newline and replace it all with a single newline.