Ipv6::split_v6_v4( string $ip ): string[]

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This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

Splits an IPv6 address into the IPv6 and IPv4 representation parts


RFC 4291 allows you to represent the last two parts of an IPv6 address using the standard IPv4 representation

Example: 0:0:0:0:0:0: 0:0:0:0:0:FFFF:


An IPv6 address


string[] [0] contains the IPv6 represented part, and [1] the IPv4 represented part


private static function split_v6_v4($ip) {
	if (strpos($ip, '.') !== false) {
		$pos       = strrpos($ip, ':');
		$ipv6_part = substr($ip, 0, $pos);
		$ipv4_part = substr($ip, $pos + 1);
		return [$ipv6_part, $ipv4_part];
	} else {
		return [$ip, ''];

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