Running an executable file in PHP

I want to compile a latex file in my PHP code, but it doesn't work. I set the permission of this file to 777. I have the following commands in my code:

$command = '/usr/bin/latex test.tex';
$output = exec($command);

When I try a simple "Hello World!" c++ executable file, it works:

$command = './hello';
$output = exec($command);

Any ide开发者_如何学JAVAa what's wrong?

Di you set the permission of the file test.txt or the file /usr/bin/latex? Because /usr/bin/latex need to be executable by www-data or whatever you websever is run as.

I would guess that latex depends on environment variables which are not being set properly.

did you try using

exec($command, $output, $retval);
var_dump($output);

in this way you can get the output (if any) of the run.. it may help detect any errors

also, try to use this instead:

pcntl_exec ( string $path [, array $args [, array $envs ]] )

so you can pass arguments and environment values in a more clean way