private function isClientServer()
    {
        if (PHP_SAPI === 'cli-server' || PHP_SAPI === 'cli' || \in_array($_SERVER['REMOTE_ADDR'] ?? [], ['127.0.0.1', 'fe80::1', '::1'], false)) {
            if (SOCKET && $ip = filter_var($_SERVER['REMOTE_ADDR'], FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) {
                \define('IP', $ip);
                return false;
            }
            \define('IP', '127.0.0.1');
            return IP;
        }
        return false;
    }
private function isClientServer()
    {
        if (PHP_SAPI === 'cli-server' || PHP_SAPI === 'cli' || \in_array($_SERVER['REMOTE_ADDR'] ?? [], ['127.0.0.1', 'fe80::1', '::1'], false)) {
            if (SOCKET && $ip = filter_var($_SERVER['REMOTE_ADDR'], FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) {
                \define('IP', $ip);
                return false;
            }
            \define('IP', '127.0.0.1');
            return IP;
        }
        return false;
    }
private function isClientServer ( ) { if ( PHP_SAPI === 'cli-server' || PHP_SAPI === 'cli' || \ in_array ( $ _SERVER [ 'REMOTE_ADDR' ] ?? [ ] , [ '127.0.0.1' , 'fe80::1' , '::1' ] , false ) ) { if ( SOCKET && $ ip = filter_var ( $ _SERVER [ 'REMOTE_ADDR' ] , FILTER_VALIDATE_IP , FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE ) ) { \ define ( 'IP' , $ ip ) ; return false ; } \ define ( 'IP' , '127.0.0.1' ) ; return IP ; } return false ; }
returns 127.0.0.1 if you are using a local development server,
otherwise returns false.
@return bool|mixed|string
returns 127 . 0 . 0 . 1 if you are using a local development server otherwise returns false .