This is a little and experimental software to try some php code in your own servers.
It is highly unrecommended used in a public server because have not restriccions of context or execution limits (that's the whole fun).
Drop the folder in your server and check the permissions and user owner, create manually the code.php file if you have creation files issues.
For use Php Sandbox in more installations/instances of php only need isstall the same files in the others serves and access directly or by other instances configuring the file of server_list.php folowing the array example.
$serverList = array(
0 => array(
'name' => 'Example',
'url' => 'https://ipAddresOrDomain.com/phpSandboxDir/index.php',
'des' => '',
),
);