如何对代码进行基准测试以查看运行速度更快

问题描述

$datetime = new DateTime('2013-01-29');
$datetime->modify('+1 day');
echo $datetime->format('Y-m-d H:i:s');

$datetime = new DateTime('2013-01-29');
$datetime->add(new DateInterval('P1D'));
echo $datetime->format('Y-m-d H:i:s');

任何人都可以告诉我，在php文件中进行大量操作时，哪一种更快，更推荐并且占用更少的内存。我认为它的DateInterval PID。有经验的开发人员吗？

Can anyone tell me which is faster, recommended and takes less memory in huge operations in php file. I think its DateInterval PID. Any experienced developer?

推荐答案

要进行基准测试，可以使用 microtime（）

To benchmark code, you can use microtime()

<?php

echo 'modify: ';
$time = microtime(1);
for ($x = 0; $x < 10000; $x++) {
    $datetime = new DateTime('2013-01-29');
    $datetime->modify('+1 day');
}
echo $datetime->format('Y-m-d H:i:s');
$end = microtime(1);
$time = $end - $time;
echo $time . "\n";

echo 'interval: ';
$time = microtime(1);
for ($x = 0; $x < 10000; $x++) {
    $datetime = new DateTime('2013-01-29');
    $datetime->add(new DateInterval('P1D'));
}
$end = microtime(1);
$time = $end - $time;
echo $time . "\n";

此输出为：

modify: 0.039623975753784
interval: 0.036103963851929

如您所见，在每次执行10,000次计算之后，DateInterval是更快的代码。但是，这就是我所说的微优化！没什么区别！

As you can see, after performing the calculation 10,000 times on each, DateInterval is the faster code. However, this is what I would call a microoptimisation! There isn't much difference!

在这里查看它的工作

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