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Bug #60131 fopen('php://stdout'...) redirect all posterious echo to /dev/null
Submitted: 2011-10-25 14:24 UTC Modified: 2011-10-30 03:14 UTC
Avg. Score:5.0 ± 0.0
Reproduced:0 of 1 (0.0%)
From: frederic dot hardy at mageekbox dot net Assigned:
Status: Wont fix Package: Streams related
PHP Version: 5.3.8 OS: Mac OS Snow Leopard
Private report: No CVE-ID: None
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From: frederic dot hardy at mageekbox dot net
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 [2011-10-25 14:24 UTC] frederic dot hardy at mageekbox dot net
If fopen('php://stdout', ...) is used in a php processus open with proc_open(), 
all posterious call to echo or print seems to be redirected to /dev/null.

Test script:

$descriptors = array(
   0 => array("pipe", "r"),
   1 => array("pipe", "w")

$php = proc_open('php', $descriptors, $pipes);

stream_set_blocking($pipes[1], 0);

fwrite($pipes[0], '<?php echo \'foo\'; fopen(\'php://stdout\', \'w\'); echo \'bar\'; ?>');

$null = null;

$select = array($pipes[1]);

while (feof($pipes[1]) === false)
	if (stream_select($select, $null, $null, null))

Expected result:

Actual result:


bug60131.diff (last revision 2011-10-30 03:14 UTC by

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 [2011-10-30 03:09 UTC]
Won't fix since some people rely on this behavior. What happens is the first time you fopen stdout, the file descriptor 1 is not duped and exposed with a stream, instead the stdlib FILE* is exposed through a stream. When the stream is closed, the FILE* is closed too, potentially also closing stdout, i.e., a close(1) syscall (which is what happens in your case – since you don't assign the return of fopen, the stream is immediately destroyed). Turns out some people use this technique to close the standard file descriptors and open others (and AFAIK there's no other way to do it in PHP).
 [2011-10-30 03:09 UTC]
-Status: Open +Status: Wont fix
 [2011-10-30 03:14 UTC]
The following patch has been added/updated:

Patch Name: bug60131.diff
Revision:   1319944441
 [2011-10-30 03:14 UTC]
For the record, I added a patch that would fix this problem.
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