From: pitrou at free dot fr
Operating system: Linux
PHP version: 4.3.2
PHP Bug Type: Output Control
Bug description: ob_start wrongly optimized out when no callback specified
Description:
------------
Newly with PHP 4.3.2, calls to ob_start with an empty handler (i.e.
ob_start("")) seem to be optimized out and ignored.
This causes two problems :
- ob_start("") can be useful if you prefer to process the
contents manually by using ob_get_contents() and then
ob_end_clean()
- nesting of output buffers is broken, because the ob_end()
call corresponding to ob_start("") is still taken (which
can totally break the page if your ob_start("") is nested
inside an ob_start("ob_gzhandler")...)
Reproduce code:
---------------
** This one doesn't work (second statement is eaten out) :
<?php
ob_start("ob_gzhandler");
ob_start("");
echo "first echo<p>";
ob_end_flush();
echo "second echo<p>";
ob_end_flush();
?>
** This one works (both statements are printed) :
<?php
function foo($x) { return $x; }
ob_start("ob_gzhandler");
ob_start("foo");
echo "first echo<p>";
ob_end_flush();
echo "second echo<p>";
ob_end_flush();
?>
Expected result:
----------------
Both programs should have the same result (i.e. print both statements on
screen).
Actual result:
--------------
The program which calls ob_start with an empty handler fails to display
the second statement. In the other program, we circumvent this bug by
using a dummy handler, which causes it to work properly.
--
Edit bug report at http://bugs.php.net/?id=24346&edit=1
--
Try a CVS snapshot: http://bugs.php.net/fix.php?id=24346&r=trysnapshot
Fixed in CVS: http://bugs.php.net/fix.php?id=24346&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=24346&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=24346&r=needtrace
Try newer version: http://bugs.php.net/fix.php?id=24346&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=24346&r=support
Expected behavior: http://bugs.php.net/fix.php?id=24346&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=24346&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=24346&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=24346&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=24346&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=24346&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=24346&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=24346&r=gnused
