Bug #74656 [Opn]: php -m command gives unreadable output when run via exec()

From: Date: Sun, 28 May 2017 03:17:50 +0000
Subject: Bug #74656 [Opn]: php -m command gives unreadable output when run via exec()
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-209286@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=74656&edit=1

 ID:                 74656
 Updated by:         pollita@php.net
 Reported by:        frederik at how2 dot be
 Summary:            php -m command gives unreadable output when run via
                     exec()
 Status:             Open
 Type:               Bug
 Package:            PHP options/info functions
 Operating System:   CentOS 7.3
 PHP Version:        7.0.19
 Block user comment: N
 Private report:     N

 New Comment:

The only way this should be able to happen is if "HTTP_ACCEPT_ENCODING=gzip" is set in
your process environment.  This can, in turn, happen if you're running your webserver PHP in
CGI mode.  This isn't something which changed between PHP5 and PHP7, however.

Has anything else in your stack changed at the same time as upgrading?

For what it's worth, you can suppress the propagation of this environment variable to your
child processes by adding the following to some earlier part of your application:
putenv("HTTP_ACCEPT_ENCODING=");


Previous Comments:
------------------------------------------------------------------------
[2017-05-26 12:17:02] frederik at how2 dot be

Further investigation points to the php.ini option: zlib.output_compression = On
When we set it to Off, the output is OK.

------------------------------------------------------------------------
[2017-05-26 09:52:02] frederik at how2 dot be

Description:
------------
When I run the command "php -m" using:
- the exec function
- the shell_exec function
- a perl equivalent of the above

The output is unreadable like this:
OUT:Array ( [1] =>
�EQ�n�0��W���CED�RUȱ7���.����á�G^{f|�޻�]rWO������)ؤB���Z���%�����y���8�5J�f�#�ҬC�dd�o�`28�ǯ���/$��RƁC�����ĪZ�iŞI���띯5-Y�d\Q(
�t�ȏ�ݹ�a]M@�Z�m�{��\M=8�Q���5������V��
) 
RET:0

Other command such as "php --version" and executing the same on PHP 5.6.30 work fine.
The get_loaded_extensions function also works fine.
also tried running it with --no-php-ini but got the same result.

I can reproduce this on 2 servers with PHP 7.0.19.

Test script:
---------------
exec($bin.' --version', $extout, $extret);
echo '<br />OUT:';
print_r($extout);
echo '<br />RET:';
print_r($extret);



------------------------------------------------------------------------



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