Opposite of nl2br? Is it str_replace?

Question

So the function nl2br is handy. Except in my web app, I want to do the opposite, interpret line breaks as new lines, since they will be echoed into a pre-filled form.

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Answer 1

An alternative to @PascalMARTIN 's answer:

$string = str_replace(array(
    '
',
    '
',
    '
',
), "\n", $string);

It does not work with multiple white-spaces like
but this should be a really rare case.