Description:
------------
If I use phpBB2 forum tags like [b][/b] or [u][/u] in a message and the text between the tags is longer then about 148 characters, the whole message becomes empty.

This problem occurs in php version 5.2.x (x=0,4,5), but not in version 4.4.7 or 5.1.6. 

When I upgraded my server to 5.2.5, I discovered this problem. Of course, I first searched for a solution on the phpBB forum, but I found nothing related to this. 

Am I the first using an older phpBB forum with a new php version, and long texts between tags?



Reproduce code:
---------------
type message in a phpBB2.0.x forum:
[u]012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789[/u]

includes/bbcode.php, function bbencode_second_pass($text, $uid):

	$text = str_replace("[u:$uid]", $bbcode_tpl['u_open'], $text);  
	$text = str_replace("[/u:$uid]", $bbcode_tpl['u_close'], $text);

the first str_replace goes well, the second one makes $text empty.



Expected result:
----------------
both string replacements are done well and the message is shown.

Actual result:
--------------
the second string replacement makes $text empty and no message is shown.