Checking exec() runs successfully or not

Question

I have been trying to let know know if the exec() command in php executes successfully or not so i can echo certain messages accordingly. I tried the following

Answer 1

i do work for me

for system linux and lang:php,laravel

exec('/usr/bin/tesseract 2.png out1 -l '.$lang,$output,$error);
           return (!$error)? "success":"Error";