linux - How to get the response status value of system command execution in PHP -


i want know response status of system command execution in php, tried below code , returns 0 value ,here code:

<?php system("ls -lrt ",$return_value); echo $return_value; ?>

in bash，it uses 0 express ok. command 'ls -lrt' not fail, return 0. if want output, should use exec()


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