split_v6_v4 example

    public static function compress($ip) {
        // Prepare the IP to be compressed.         // Note: Input validation is handled in the `uncompress()` method, which is the first call made in this method.         $ip       = self::uncompress($ip);
        $ip_parts = self::split_v6_v4($ip);

        // Replace all leading zeros         $ip_parts[0] = preg_replace('/(^|:)0+([0-9])/', '\1\2', $ip_parts[0]);

        // Find bunches of zeros         if (preg_match_all('/(?:^|:)(?:0(?::|$))+/', $ip_parts[0], $matches, PREG_OFFSET_CAPTURE)) {
            $max = 0;
            $pos = null;
            foreach ($matches[0] as $match) {
                if (strlen($match[0]) > $max) {
                    $max = strlen($match[0]);
                    

    public static function compress($ip)
    {
        // Prepare the IP to be compressed         $ip = self::uncompress($ip);
        $ip_parts = self::split_v6_v4($ip);

        // Replace all leading zeros         $ip_parts[0] = preg_replace('/(^|:)0+([0-9])/', '\1\2', $ip_parts[0]);

        // Find bunches of zeros         if (preg_match_all('/(?:^|:)(?:0(?::|$))+/', $ip_parts[0], $matches, PREG_OFFSET_CAPTURE))
        {
            $max = 0;
            $pos = null;
            foreach ($matches[0] as $match)
            {