This issue seems to only affect PHP 4.0.5, not earlier versions, as far as I can tell.

The following code gives an error:

<?

$string="

[code]

EXEC sp_addlinkedserver 'TillDB', 'Access 2000', 'Microsoft.Jet.OLEDB.4.0', '\\till01\C\endx\data\ct.mdb'
EXEC sp_addlinkedsrvlogin 'TillDB', false, NULL, 'Admin', NULL
EXEC sp_dropserver 'TIllDB', 'droplogins'

[/code]

";

function stripbrsfromcode($str) {
  return ($str);
}

//$string=str_replace("'","\'",$string);
$string=addslashes($string);

echo $string;


$string=preg_replace("/(\[)(code)(])(\r\n)*(.*)(\[\/code\])/esiU","stripbrsfromcode('\\5')",$string);

echo $string;
?>

The error is as follows:
[code] EXEC sp_addlinkedserver \'TillDB\', \'Access 2000\', \'Microsoft.Jet.OLEDB.4.0\', \'\till01\C\endx\data\ct.mdb\' EXEC sp_addlinkedsrvlogin \'TillDB\', false, NULL, \'Admin\', NULL EXEC sp_dropserver \'TIllDB\', \'droplogins\' [/code] 
Parse error: parse error in /usr/local/apache/htdocs/test.php(24) : regexp code on line 5

Fatal error: Failed evaluating code: stripbrsfromcode(' EXEC sp_addlinkedserver \\\'TillDB\\\', \\\'Access 2000\\\', \\\'Microsoft.Jet.OLEDB.4.0\\\', \\\'\\till01\\C\\endx\\data\\ct.mdb\\\' EXEC sp_addlinkedsrvlogin \\\'TillDB\\\', false, NULL, \\\'Admin\\\', NULL EXEC sp_dropserver \\'TIllDB\\', \\'droplogins\\' ') in /usr/local/apache/htdocs/test.php on line 24


Let me know if you need other info. I have seen this problem on two independant configurations, so I am fairly sure it is not the server.

phpinfo here:
http://161.58.186.97/phpinfo.php