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When you use exec in php to call shells like python, perl or other script. please follow the step below for your debugging:
| 1 | exec ( "$your_command_here 2>&1" , $output , $return_status ); |
the “2>&1” is the key point for debugging, because it can redirect the error message to standard output. Also, when you shell encounter an error, the $return_status will be 1 (success with 0).
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