PHP-8将于今年年底发布，其最令人期待的功能之一就是JIT编译。让我们通过本文来看看这项功能对PHP脚本的速度有怎样的影响？
作者
PedroEscudero
译者
弯月，责编
郭芮
以下为译文：
今年年底，PHP-8即将发布。虽然这个主版本有很多新功能，例如联合类型、静态返回和弱映射等，但最令人期待的改进还是JIT编译器。
从理论上讲，JIT处理PHP脚本编译的方式能够提高应用程序的速度。但让我们来看看这种方法能否达到我们的期望。
请注意，在本文中使用的PHP-8不是最终版本。
首先，我们来编写一段运行的代码。我选择了冒泡排序，因为这是最差的排序算法，只有这种测试的时候我才能用这个排序算法。
?phpfunctionbubble_sort(array){start=microtime(true);do{sw=false;for(i=0,size=count(array)-1;isize;i++){if(array[i]array[i+1]){list(array[i+1],array[i])=array(array[i],array[i+1]);sw=true;}}}while(sw);end=microtime(true);returnend-start;}array=array(,-,3,0,2,77,5,-1,4,34,-,1,0.5,-3,0.88,,,0.99,-44,4,,-44,23,-,,,0.99,-44,4,,-4,,-,,,0.99,-44,4,,-4,2.3,-2.01,,,0.99,-44,4,53,-4,23,-,,,0.99,23,,,-4,23,-,,,0.99,-4.14,4,,-4,23,-,,,0.99,-4.44,4,,-4,23,-,,,0.99,-4.4,4,,-4,23,-,-,-,0.99,-44,4,,-4,23,-1,,,0.19,-44,4,,-4,23,-21,,,0.,-44,4,,-4,23,-20.1,,2,0.,-44,4,,-4,2.,-,3033,33,0.49,-44,4,,-4,2.3,-,,,0.99,-44,4,,-44,23,-,,,0.99,-44,4,,-4,,-,,,0.99,-44,4,,-4,2.3,-2.01,,,0.99,-44,4,53,-4,23,-,,,0.99,23,,,-4,23,-,,,0.99,-4.14,4,,-4,23,-,,,0.99,-4.44,4,,-4,23,-,,,0.99,-4.4,4,,-4,23,-,-,-,0.99,-44,4,,-4,23,-1,,,0.19,-44,4,,-4,23,-21,,,0.,-44,4,,-4,23,-20.1,,2,0.,-44,4,,-4,2.,-,3033,33,0.49,-44,4,,-4,2.3,-,,,0.99,-44,4,,-44,23,-,,,0.99,-44,4,,-4,,-,,,0.99,-44,4,,-4,2.3,-2.01,,,0.99,-44,4,53,-4,23,-,,,0.99,23,,,-4,23,-,,,0.99,-4.14,4,,-4,23,-,,,0.99,-4.44,4,,-4,23,-,,,0.99,-4.4,4,,-4,23,-,-,-,0.99,-44,4,,-4,23,-1,,,0.19,-44,4,,-4,23,-21,,,0.,-44,4,,-4,23,-20.1,,2,0.,-44,4,,-4,2.,-,3033,33,0.49,-44,4,,-4,2.3,-,,,0.99,-44,4,,-44,23,-,,,0.99,-44,4,,-4,,-,,,0.99,-44,4,,-4,2.3,-2.01,,,0.99,-44,4,53,-4,23,-,,,0.99,23,,,-4,23,-,,,0.99,-4.14,4,,-4,23,-,,,0.99,-4.44,4,,-4,23,-,,,0.99,-4.4,4,,-4,23,-,-,-,0.99,-44,4,,-4,23,-1,,,0.19,-44,4,,-4,23,-21,,,0.,-44,4,,-4,23,-20.1,,2,0.,-44,4,,-4,2.,-,3033,33,0.49,-44,4,,-4,2.3,-,,,0.99,-44,4,,-44,23,-,,,0.99,-44,4,,-4,,-,,,0.99,-44,4,,-4,2.3,-2.01,,,0.99,-44,4,53,-4,23,-,,,0.99,23,,,-4,23,-,,,0.99,-4.14,4,,-4,23,-,,,0.99,-4.44,4,,-4,23,-,,,0.99,-4.4,4,,-4,23,-,-,-,0.99,-44,4,,-4,23,-1,,,0.19,-44,4,,-4,23,-21,,,0.,-44,4,,-4,23,-20.1,,2,0.,-44,4,,-4,2.,-,3033,33,0.49,-44,4,,-4,2.3,-,,,0.99,-44,4,,-44,23,-,,,0.99,-44,4,,-4,,-,,,0.99,-44,4,,-4,2.3,-2.01,,,0.99,-44,4,53,-4,23,-,,,0.99,23,,,-4,23,-,,,0.99,-4.14,4,,-4,23,-,,,0.99,-4.44,4,,-4,23,-,,,0.99,-4.4,4,,-4,23,-,-,-,0.99,-44,4,,-4,23,-1,,,0.19,-44,4,,-4,23,-21,,,0.,-44,4,,-4,23,-20.1,,2,0.,-44,4,,-4,2.,-,3033,33,0.49,-44,4,,-4,2.3,-,,,0.99,-44,4,,-44,23,-,,,0.99,-44,4,,-4,,-,,,0.99,-44,4,,-4,2.3,-2.01,,,0.99,-44,4,53,-4,23,-,,,0.99,23,,,-4,23,-,,,0.99,-4.14,4,,-4,23,-,,,0.99,-4.44,4,,-4,23,-,,,0.99,-4.4,4,,-4,23,-,-,-,0.99,-44,4,,-4,23,-1,,,0.19,-44,4,,-4,23,-21,,,0.,-44,4,,-4,23,-20.1,,2,0.,-44,4,,-4,2.,-,3033,33,0.49,-44,4,,-4,2.3,-,,,0.99,-44,4,,-44,23,-,,,0.99,-44,4,,-4,,-,,,0.99,-44,4,,-4,2.3,-2.01,,,0.99,-44,4,53,-4,23,-,,,0.99,23,,,-4,23,-,,,0.99,-4.14,4,,-4,23,-,,,0.99,-4.44,4,,-4,23,-,,,0.99,-4.4,4,,-4,23,-,-,-,0.99,-44,4,,-4,23,-1,,,0.19,-44,4,,-4,23,-21,,,0.,-44,4,,-4,23,-20.1,,2,0.,-44,4,,-4,2.,-,3033,33,0.49,-44,4,,-4,2.3,-,,,0.99,-44,4,,-44,23,-,,,0.99,-44,4,,-4,,-,,,0.99,-44,4,,-4,2.3,-2.01,,,0.99,-44,4,53,-4,23,-,,,0.99,23,,,-4,23,-,,,0.99,-4.14,4,,-4,23,-,,,0.99,-4.44,4,,-4,23,-,,,0.99,-4.4,4,,-4,23,-,-,-,0.99,-44,4,,-4,23,-1,,,0.19,-44,4,,-4,23,-21,,,0.,-44,4,,-4,23,-20.1,,2,0.,-44,4,,-4,2.,-,3033,33,0.49,-44,4,,-4,2.3,-,,,0.99,-44,4,,-44,23,-,,,0.99,-44,4,,-4,,-,,,0.99,-44,4,,-4,2.3,-2.01,,,0.99,-44,4,53,-4,23,-,,,0.99,23,,,-4,23,-,,,0.99,-4.14,4,,-4,23,-,,,0.99,-4.44,4,,-4,23,-,,,0.99,-4.4,4,,-4,23,-,-,-,0.99,-44,4,,-4,23,-1,,,0.19,-44,4,,-4,23,-21,,,0.,-44,4,,-4,23,-20.1,,2,0.,-44,4,,-4,2.,-,3033,33,0.49,-44,4,,-4,2.3,-,,,0.99,-44,4,,-44,23,-,,,0.99,-44,4,,-4,,-,,,0.99,-44,4,,-4,2.3,-2.01,,,0.99,-44,4,53,-4,23,-,,,0.99,23,,,-4,23,-,,,0.99,-4.14,4,,-4,23,-,,,0.99,-4.44,4,,-4,23,-,,,0.99,-4.4,4,,-4,23,-,-,-,0.99,-44,4,,-4,23,-1,,,0.19,-44,4,,-4,23,-21,,,0.,-44,4,,-4,23,-20.1,,2,0.,-44,4,,-4,2.,-,3033,33,0.49,-44,4,,-4,2.3,-,,,0.99,-44,4,,-44,23,-,,,0.99,-44,4,,-4,,-,,,0.99,-44,4,,-4,2.3,-2.01,,,0.99,-44,4,53,-4,23,-,,,0.99,23,,,-4,23,-,,,0.99,-4.14,4,,-4,23,-,,,0.99,-4.44,4,,-4,23,-,,,0.99,-4.4,4,,-4,23,-,-,-,0.99,-44,4,,-4,23,-1,,,0.19,-44,4,,-4,23,-21,,,0.,-44,4,,-4,23,-20.1,,2,0.,-44,4,,-4,2.,-,3033,33,0.49,-44,4,,-4,2.3,-200);echo\n;echobubble_sort(array);echo\n;?
我知道这个脚本编写的并不是很好，尤其是中间那个讨厌的数组。我知道我可以生成一个随机数组。我也知道我可以从文件中读取这个数组。但是，我只想要一个不需要考虑其他因素的非常慢的冒泡算法。我不希望这个基准测试中出现任何额外的干扰。
首先，我们在当前的PHP7.4版本中运行脚本：
dockercontainerrun--rm-v(pwd):/script/php:7.4php/script/bubble.php
运行次得到的平均时间为0.10500936秒——还不错。
现在我们在PHP-8中运行，先不要激活JIT。
dockercontainerrun--rm-v(pwd):/script/martinpham/php8:fpm-extra-alpinephp/script/bubble.php
同样运行次的平均时间为0.秒。老实说，这个提升不怎么明显。
下面，我们来测试期待已久的JIT：
dockercontainerrun--rm-v(pwd):/script/keinos/php8-jitphp/script/bubble.php
平均运行时间为0.秒！JIT确实很惊喜！对于像我这样非常