Detecting two newlines

[Jeremysr]

I'm making a program where someone enters text into a textbox and then in the next page I need to change all the double newlines ("\n\n") into two linebreak tags. For some reason this works:

[code]str_replace("\n", "<br />", $input);[/code]

But this doesn't work:

[code]str_replace("\n\n", "<br /><br />", $input);[/code]

I want the single newlines to be ignored though. Can someone tell me what the problem is?

[Orio]

Use [url=http://www.php.net/manual/en/function.nl2br.php]nl2br()[/url].

The reason this doesn't work is because there's also the carriage return char. This would probbly work:
[code]str_replace("\r\n", "<br />", $input);[/code]

Orio.

[Jeremysr]

Ok thanks. I couldn't use nl2br() because it changes all of the newlines to br tags but I only want to change double newlines, not all of them. I'll try "\r\n\r\n".