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Old 10-06-2012, 05:07 AM   #1
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Different results - running program from bash and PHP

Hello everybody,

I am using CentOS 5.6 and I have problems executing programs from PHP. When I run the same command from bash as root, it works fine.

PHP script I am executing:
PHP Code:

echo (shell_exec("/opt/bin/mediainfo --Inform=file:///var/www/html/test/media_general.txt /var/www/html/test/video/2046.flv")); 

When I run this script, it does not produce any input, in error log, it shows
/opt/bin/mediainfo: error while loading shared libraries: cannot open shared object file: No such file or directory
When I run command
/opt/bin/mediainfo --Inform=file:///var/www/html/test/media_general.txt /var/www/html/test/video/2046.flv
in bash as root, it works fine, gives the output it should give.

I am new to Linux, but is it because Apache does not have enough rights? The file /opt/bin/mediainfo has 0777 permissions, owner root, group root. I execute from PHP more similar programs, some run fine, but some give an error, usually they cannot load some libraries. Can it be fixed somehow?

Thanks in advance for any help.
Old 10-07-2012, 10:51 AM   #2
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You may have different PATH variables. In bash, run

echo $PATH
and in PHP

PHP Code:
<?php echo ini_get('include_path'); ?>
and compare the results my guess is that the folder with is in bash's path but not PHP's.

Hope this helps,
Old 10-07-2012, 02:09 PM   #3
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It is probably an environment variable difference, but I don't think it is $PATH. $LD_LIBRARY_PATH will affect how the linking loader finds libraries. You can do something to set $LD_LIBRARY_PATH before the script runs. I don't know how to set environment variables from within PHP, but I assume it is possible. You can configure ld to search the correct directory globally and permanently by using the ldconfig tool.

--- rod.
Old 10-08-2012, 02:53 AM   #4
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*facepalm* yeah, of course, we're on about libraries. Ooops.

To change the LD_LIBRARY_PATH environment variable from within PHP, you need to use putenv, but from what the page says you may have difficulty if your PHP is configured to be in 'safe mode'.



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