Can't run bash script in PHP

Question

I'm trying to run bash script in PHP but can't run it. php -v

PHP 5.3.10-1ubuntu3.2 with Suhosin-Patch (cli) (built: Jun 13 2012 17:19:58)
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2012 Zend Technologies

Ubuntu 12.04 LTS 64 bit.

My php code:

    $cmd='/www/var/pl/bash.sh';
    $retval =-1;
    exec( $cmd, $output ); //executing the exec function.
    foreach( $output as $tmp ) 
    { 
        echo "$tmp <br>"; 
    };

bash.sh:

 #!/bin/bash
swipl --quiet -s /var/www/pl/ples.pl -g "f(R, gel), writeln(R),open('/var/www/pl/in.txt',write, Stream),
write(Stream, (R)),
nl(Stream),
close(Stream)" -t halt.

What am I doing wrong?

And I can run bash.sh in the Linux terminal.

Answer 1

When you run the script in the terminal you are executing it under the account you are logged in to. You have a shell setup with a search path etc.

When php executes the script, it has not a shell setup, and runs under the webserver user account. When executing:

• make sure you have complete paths to your file, swipl is not enough, it should be /path/to/swipl
• make sure the webserver process has enough access rights to get everything it needs.