Ben php belirli çalıştırılabilir dosyaları çalıştırmak için exec fonksiyonunu kullanıyorum.

exec ( $file , $output , $return_value  ) ;

When the given file executed successfully I am able to get the output in the second argument by checking the return values , So, It is working fine. But My requirement is when the command execution getting failed due to some reason. I need to get that error message of that executed program . What I need to do to get the error . through second argument we can get the successful output only . Not error message.

Teşekkürler.