<?php file_get_contents( string $filename, bool $use_include_path = false, ?resource $context = null, int $offset = 0, ?int $length = null): string|false
<?php private function checkIpv4() { if ($this->ipv4 === null) { $this->ipv4 = !!@file_get_contents('http://ipv4.tlund.se/'); } if (!$this->ipv4) {
<?php private function checkIpv6() { if ($this->ipv6 === null) { $this->ipv6 = !!@file_get_contents('http://ipv6.tlund.se/'); } if (!$this->ipv6) {