Determines if a specified string represents an IP address or not.

Description

This function also detects the type of the IP address, returning either ‘4’ or ‘6’ to represent an IPv4 and IPv6 address respectively.
This does not verify if the IP is a valid IP, only that it appears to be an IP address.

Parameters

$maybe_ipstringrequired

A suspected IP address.

Return

Source

public static function is_ip_address( $maybe_ip ) {
	if ( preg_match( '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $maybe_ip ) ) {
		return 4;
	}

	if ( str_contains( $maybe_ip, ':' ) && preg_match( '/^(((?=.*(::))(?!.*\3.+\3))\3?|([\dA-F]{1,4}(\3|:\b|$)|\2))(?4){5}((?4){2}|(((2[0-4]|1\d|[1-9])?\d|25[0-5])\.?\b){4})$/i', trim( $maybe_ip, ' []' ) ) ) {
		return 6;
	}

	return false;
}

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