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<?php exec('root','123456'); ?>
Output for 8.3.0 - 8.3.6
Fatal error: Uncaught Error: exec(): Argument #2 ($output) could not be passed by reference in /in/o1LIW:1 Stack trace: #0 {main} thrown in /in/o1LIW on line 1
Process exited with code 255.
Output for 8.1.23 - 8.1.28, 8.2.10 - 8.2.18
Fatal error: Uncaught Error: exec(): Argument #2 ($output) cannot be passed by reference in /in/o1LIW:1 Stack trace: #0 {main} thrown in /in/o1LIW on line 1
Process exited with code 255.
Output for 5.3.0 - 5.3.19, 5.4.0 - 5.4.9
Fatal error: Only variables can be passed by reference in o1LIW on line 1
Process exited with code 255.

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