I need to develop an interface that will, for example, ping IPs from a
remote server. So the php script will be hosted in a server with ssh access
(key) to the remote server.

I can make it work from the console but when I try

$cmd = "ssh remote-server 'ping -c 4 ip'"
exec($cmd, $ouput);

the output is empty.

the same command (with the remote-server and IP changed to the real ones)
works fine from command line.

I've added the key/config in the webserver's user .ssh directory so I am
assuming that that there is something wrong with my setup.

any ideas?

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