function test_redis_connection_speed($host = '127.0.0.1', $port = 6379, $password = '', $db = 0, $iterations = 100)
{
    $connection_times = array();

    for ($i = 1; $i <= $iterations; $i++) {
        $start_time = microtime(true);

        try {
            // Create a new Redis connection
            $redis = new Redis();
            $redis->connect($host, $port);
            $redis->auth($password);
            // Optionally select a database
            $redis->select($db);
            // Send a PING command to check if the connection is alive
            $ping_result = $redis->ping();

            if ($ping_result) {
                $end_time = microtime(true);
                $connection_times[] = $end_time - $start_time;
                echo "Iteration $i: Connection established successfully. Time taken: " . number_format($end_time - $start_time, 6) . " seconds\n";
            } else {
                echo "Iteration $i: Unexpected response from PING command.\n";
            }
        } catch (Exception $e) {
            echo "Failed to establish connection on iteration $i: " . $e->getMessage() . "\n";
            break;
        }

        // Close the connection after each iteration
        $redis->close();
    }

    if (!empty($connection_times)) {
        $avg_time = array_sum($connection_times) / count($connection_times);
        $min_time = min($connection_times);
        $max_time = max($connection_times);
        sort($connection_times); // Sort for median calculation
        $median_time = ($connection_times[floor((count($connection_times) - 1) / 2)] + $connection_times[ceil((count($connection_times) - 1) / 2)]) / 2;

        echo "\nTest completed after $iterations iterations.\n";
        echo "Average connection time: " . number_format($avg_time, 6) . " seconds\n";
        echo "Median connection time: " . number_format($median_time, 6) . " seconds\n";
        echo "Minimum connection time: " . number_format($min_time, 6) . " seconds\n";
        echo "Maximum connection time: " . number_format($max_time, 6) . " seconds\n";
    }
}

// Call the function with desired parameters
test_redis_connection_speed('127.0.0.1', 6379, 'password', 0, 20);