Error in php 7

[Emrod82]

Cannot make this work in php 7. It throw error, from code:

else {
$ip = gmp_init(strval($ip), 10);
if ($format == "default") {
if(is_ipv4($ip))
$format = "dotted";
else
$format = "ipv6";
}

Error: the XML response that was returned from the server is invalid. Received:
Warning: gmp_init(): Unable to convert variable to GMP - string is not an integer in /opt/ona/www/include/functions_general.inc.php on line 638

Warning: gmp_init(): Unable to convert variable to GMP - string is not an integer in /opt/ona/www/include/functions_general.inc.php on line 638

Warning: gmp_init(): Unable to convert variable to GMP - string is not an integer in /opt/ona/www/include/functions_general.inc.php on line 638

Warning: gmp_init(): Unable to convert variable to GMP - string is not an integer in /opt/ona/www/include/functions_general.inc.php on line 638

Warning: gmp_init(): Unable to convert variable to GMP - string is not an integer in /opt/ona/www/include/functions_general.inc.php on line 638