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PHP exec - previous folder

I want to run this part of PHP code.

$s=shell_exec("../sustav/zadatak/Generator_slika.exe ".$argumenti);

But I see that php doesn't run this command and didn't give me any error. So I wounder can I write ../ this in exec.
Thanks

Quoting the PHP Manual :

Note: When safe mode is enabled, you can only execute files within the safe_mode_exec_dir. For practical reasons, it is currently not allowed to have .. components in the path to the executable .

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