PHP中封装性的性能测试与优化方法

// 未优化的代码
function calculateAverage($data) {
    $total = 0;
    foreach ($data as $value) {
        $total += $value;
    }
    return $total / count($data);
}

$data = [1, 2, 3, 4, 5];
$average = calculateAverage($data);
echo $average;

// 优化后的代码
function calculateAverage($data) {
    $total = array_sum($data);
    return $total / count($data);
}

$data = [1, 2, 3, 4, 5];
$average = calculateAverage($data);
echo $average;

// 未优化的代码
function fibonacci($n) {
    if ($n <= 1) {
        return $n;
    } else {
        return fibonacci($n-1) + fibonacci($n-2);
    }
}

$result = fibonacci(10);
echo $result;

// 优化后的代码
function fibonacci($n) {
    $cache = [];
    
    if ($n <= 1) {
        return $n;
    } else {
        if (isset($cache[$n])) {
            return $cache[$n];
        }
        
        $result = fibonacci($n-1) + fibonacci($n-2);
        $cache[$n] = $result;
        
        return $result;
    }
}

$result = fibonacci(10);
echo $result;