Description:
------------
---
From manual page: https://php.net/function.system
---
i want execute linux shell via php.if the shell works fine,the $output will be filled with every line of output from the shell script.but if shell script has error,$output is filled whith nothing. i have used the func of python which is commands.getoutput,Get the result regardless of whether the script has an error.

Test script:
---------------
<?php
$lastOutput = exec("gunzip < /backup-files/test.sql.gz | mysql -u*** -p'***' --host=localhost --database=test",$output,$return_var);