Edit report at https://bugs.php.net/bug.php?id=61272&edit=1
ID: 61272
Comment by: dragon829 at gmail dot com
Reported by: peacech at gmail dot com
Summary: ob_start callback get passed empty string
Status: Re-Opened
Type: Bug
Package: Output Control
Operating System: Arch 32 bit
PHP Version: 5.4.0
Block user comment: N
Private report: N
New Comment:
We have the same problem in 5.4.4,and it hasn't reproduced in 5.3.14 .
Previous Comments:
------------------------------------------------------------------------
[2012-06-08 08:03:50] casper at langemeijer dot eu
Mike, I've dug a bit deeper into this problem, and must conclude that this
really is a bug, or at least a change of behaviour.
I think test tests/output/ob_017.phpt is faulty too. I corrected bot output.c
and the test in the patch I supplied.
In PHP 5.3 the callback function is called with the contents of the output
buffer when ob_clean or ob_end_clean is called. The output will be fed to the
callback function, but is erased right after that call.
After your output buffering rewrite the output buffer is cleaned before the
callback is called.
I see no valid reason for a functional change. You're supplying the callback
with a flag so that if needed the callback function could do this itself if
needed.
------------------------------------------------------------------------
[2012-05-18 10:04:18] patrick at procurios dot nl
We are having the same problem and it keeps us from migrating to 5.4. Could you
please fix it?
------------------------------------------------------------------------
[2012-03-05 14:43:25] peacech at gmail dot com
Unless ob_start callback specification has changed that for
ob_clean/ob_end_clean, the output is discarded before calling the callback,
then this is a bug. And I have scan the PHP 5.4 changelog and couldn't find
anything mentioning this change.
So let me help by showing where the problem is
In line 1226 of output.c in the distributed PHP 5.4.0 source,
if (flags & PHP_OUTPUT_POP_DISCARD) {
context.op |= PHP_OUTPUT_HANDLER_CLEAN;
orphan->buffer.used = 0;
}
php_output_handler_op(orphan, &context);
orphan->buffer.used should not be set to 0 before calling the callback,
otherwise the callback will be called with empty buffer.
And likewise in line 300 in php_output_clean
So, no, it isn't about appending $output to $buffer.
------------------------------------------------------------------------
[2012-03-05 11:23:43] [email protected]
Sorry, but your problem does not imply a bug in PHP itself. For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions. Due to the volume
of reports we can not explain in detail here why your report is not
a bug. The support channels will be able to provide an explanation
for you.
Thank you for your interest in PHP.
You should append $output to $buffer.
------------------------------------------------------------------------
[2012-03-04 10:53:53] peacech at gmail dot com
Description:
------------
Running test script below with PHP 5.4 outputs
""
Running test script below with PHP 5.3 outputs
"hello"
Test script:
---------------
<?php
$buffer = -1;
function callback($output)
{
global $buffer;
$buffer = $output;
return $output;
}
ob_start('callback');
echo 'hello';
ob_get_clean();
var_dump($buffer);
Expected result:
----------------
"hello"
Actual result:
--------------
""
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=61272&edit=1
