PHP 函數效能基準測試：比較不同實作並提高效率

// 开始计时
$startTime = microtime(true);

// 调用要测试的函数
$result = doSomething();

// 结束计时并计算执行时间
$endTime = microtime(true);
$executionTime = $endTime - $startTime;

echo "Execution time: " . $executionTime . " seconds";

// 使用 mb_strtoupper()
$startTime = microtime(true);
$result1 = mb_strtoupper($string);
$endTime = microtime(true);
$executionTime1 = $endTime - $startTime;

// 使用 strtoupper()
$startTime = microtime(true);
$result2 = strtoupper($string);
$endTime = microtime(true);
$executionTime2 = $endTime - $startTime;

// 使用 ucwords()
$startTime = microtime(true);
$result3 = ucwords($string);
$endTime = microtime(true);
$executionTime3 = $endTime - $startTime;

echo "mb_strtoupper() execution time: " . $executionTime1 . " seconds\n";
echo "strtoupper() execution time: " . $executionTime2 . " seconds\n";
echo "ucwords() execution time: " . $executionTime3 . " seconds\n";

// 要测试的函数
function getWords($string1, $string2) {
    // 创建两个数组
    $words1 = explode(" ", $string1);
    $words2 = explode(" ", $string2);

    // 合并两个数组并返回唯一元素
    return array_unique(array_merge($words1, $words2));
}

// 基准测试
$startTime = microtime(true);
$words = getWords($string1, $string2);
$endTime = microtime(true);
$executionTime = $endTime - $startTime;

echo "Execution time: " . $executionTime . " seconds";

// 优化后的代码
function getWords($string1, $string2) {
    // 创建两个数组
    $words1 = explode(" ", $string1);
    $words2 = explode(" ", $string2);

    // 合并两个数组并返回唯一元素
    return array_unique(array_merge($words1, $words2));
}