note 97972 modified in function.nl2br by danbrown

Recursive solution to avoid replacing newlines inside <pre> tags:

<?php
	function findOpenPre($line) {
		$start = strpos($line,'<pre');
		if ($start === false) {
			return nl2br($line);
		} else {
			return nl2br(substr($line,0,$start-1)).findClosePre(substr($line,$start));
		}
	}
	
	function findClosePre($line) {
		$start = strpos($line,'</pre>');
		if ($start === false) {
			return $line.'</pre>'; # should never come here
		} else {
			return substr($line,0,$start+6).findOpenPre(substr($line,$start+7));
		}
	}

	echo findOpenPre('hello '.chr(10).'<pre> world'.chr(10).'</pre>');
?>

will return "hello <br><pre> world\n</pre>"
instead of "hello <br><pre> world<br></pre>"

Jose.

--was--
Recursive solution to avoid replacing newlines inside <pre> tags:

	function findOpenPre($line) {
		$start = strpos($line,'<pre');
		if ($start === false) {
			return nl2br($line);
		} else {
			return nl2br(substr($line,0,$start-1)).findClosePre(substr($line,$start));
		}
	}
	
	function findClosePre($line) {
		$start = strpos($line,'</pre>');
		if ($start === false) {
			return $line.'</pre>'; # should never come here
		} else {
			return substr($line,0,$start+6).findOpenPre(substr($line,$start+7));
		}
	}

	echo findOpenPre('hello '.chr(10).'<pre> world'.chr(10).'</pre>');

will return "hello <br><pre> world\n</pre>"
instead of "hello <br><pre> world<br></pre>"

Jose.

http://php.net/manual/en/function.nl2br.php