#49816 [NEW]: output corruption using flush

From: Date: Thu, 08 Oct 2009 20:06:52 +0000
Subject: #49816 [NEW]: output corruption using flush
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-143395@lists.php.net to get a copy of this message 
From:             paul at wcclan dot net
Operating system: FreeBSD 7.2-RELEASE-p4
PHP version:      5.2.11
PHP Bug Type:     Output Control
Bug description:  output corruption using flush

Description:
------------
Looping through the output of a process opened with popen while using
flush return "garbage" in the browser. Using telnet the intended output can
be seen in (likely corrupted) chuncked encoding. Commenting out the flush()
in below code fixes the problem.

Reproduce code:
---------------
<?
    $handle = popen("whois php.net", "r");

    if($handle)
    {
        while(!feof($handle))
        {
            $buffer = fgets($handle);
            echo $buffer . "<br />\r\n";
            flush();
        }
        pclose($handle);
    }
?>


Expected result:
----------------
the output of the command whois php.net

Actual result:
--------------
seemingly random garbage in browser. Above script available through:
http://ipv6.wcclan.net/test.php

-- 
Edit bug report at http://bugs.php.net/?id=49816&edit=1
-- 
Try a snapshot (PHP 5.2):            http://bugs.php.net/fix.php?id=49816&r=trysnapshot52
Try a snapshot (PHP 5.3):            http://bugs.php.net/fix.php?id=49816&r=trysnapshot53
Try a snapshot (PHP 6.0):            http://bugs.php.net/fix.php?id=49816&r=trysnapshot60
Fixed in SVN:                        http://bugs.php.net/fix.php?id=49816&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=49816&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=49816&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=49816&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=49816&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=49816&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=49816&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=49816&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=49816&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=49816&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=49816&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=49816&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=49816&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=49816&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=49816&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=49816&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=49816&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=49816&r=mysqlcfg

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