$explode = explode (' ', $data);

$ip = $explode[4];

$explode2 = expldoe(':', $explode[4]);

$ip = $explode2[0];

$port = $explode2[1];


is the same as

list(, , , $ip)  = explode (' ', $data);
list($ip, $port) = explode (':', $ip);