Restarting MySQL using PHP Script

I am writting a script to restart mysql at a certain check, but I am unable to run the following from PHP:

exec('/sbin/service mysqld restart');

/sbin/service mysqld restart, when run from SSH succussfully restarts mySQL.

Please help me, if I am doing any mistake and correct me.

Do we have to give any permissions to this file, as presently this file is owned by a user not root.
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Maybe exec is disabled in php.ini?
Search for "disable_functions" in php.ini and check if exec is disabled

Do you get an error message?
tripatAuthor Commented:
exec is enabled I am sure because, in same program I running this:

exec('uptime') and caculating load average from this.
tripatAuthor Commented:

I have tried this:

exec('/sbin/service mysqld restart ',$output);

and I get the following output:

    [0] => Shutting down MySQL...................................[FAILED]
    [1] => Starting MySQL[  OK  ]

does it mean PHP does not have rights to execute this command?

to restart a service it needs root privs.

you would either have to setup what ever is running this php script, like apache to use root instead of wwwuser or whatever it's using.

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