From: robin_fernandes at uk dot ibm dot com
Operating system: Windows
PHP version: 5CVS-2007-09-12 (snap)
PHP Bug Type: Output Control
Bug description: ob_start(): inconsistent behaviour with undefined callbacks
Description:
------------
ob_start() can initialize multiple output buffers in a single call using a
comma delimited list of output callbacks, as follows:
ob_start('f,f,f');
where function f() is a defined function.
However, behaviour when passing an undefined callback is inconsistent:
ob_start('non_existent,f');
returns false and initializes no output buffers, whereas
ob_start('non_existent,f,f');
returns true and initializes 2 output buffers with f as a callback.
Using arrays, the behaviour is consistent. The following both return false
and initialize no output buffers:
ob_start(array('non_existent', 'f'));
ob_start(array('non_existent', 'f', 'f'));
Tested on Windows XP on PHP 5.2.5-dev (cli) (built: Sep 12 2007 04:04:36).
Reproduce code:
---------------
<?php
function f($str) {
return $str;
}
function checkAndClean() {
print_r(ob_list_handlers());
while (ob_get_level()>0) {
ob_end_flush();
}
}
var_dump(ob_start(array('non_existent', 'f')));
checkAndClean();
var_dump(ob_start(array('non_existent', 'f', 'f')));
checkAndClean();
var_dump(ob_start('non_existent,f'));
checkAndClean();
var_dump(ob_start('non_existent,f,f')); //bug: expecting false with no
output buffers. Actually returns true and initialises 2 output buffers.
checkAndClean();
?>
Expected result:
----------------
bool(false)
Array
(
)
bool(false)
Array
(
)
bool(false)
Array
(
)
bool(false)
Array
(
)
Actual result:
--------------
bool(false)
Array
(
)
bool(false)
Array
(
)
bool(false)
Array
(
)
bool(true)
Array
(
[0] => f
[1] => f
)
--
Edit bug report at http://bugs.php.net/?id=42641&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=42641&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=42641&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=42641&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=42641&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=42641&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=42641&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=42641&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=42641&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=42641&r=support
Expected behavior: http://bugs.php.net/fix.php?id=42641&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=42641&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=42641&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=42641&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=42641&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=42641&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=42641&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=42641&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=42641&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=42641&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=42641&r=mysqlcfg
