ip2long

Supported Versions: PHP 4, PHP 5, PHP 7, PHP 8

Converts a string containing an (IPv4) Internet Protocol dotted address into a long integer

<?php ip2long(string $ip): int|false

reactphp/event-loop

<?php $ip = gethostbyname('www.google.com');

if (ip2long($ip) === false) {

    echo 'Unable to resolve hostname' . PHP_EOL;

    exit(1);

}