Linux 下的 time 命令可以获取命令执行时间，Windows 下并没有类似的命令，我们可以自力更生写一个批处理，命名为time.bat。

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@echo off

set /a StartMS=%time:~3,1%*60000 + %time:~4,1%*6000 + %time:~6,1%*1000 + %time:~7,1%*100 + %time:~9,1%*10 + %time:~10,1%

%1 %2 %3 %4 %5 %6

set /a EndMS =%time:~3,1%*60000 + %time:~4,1%*6000 + %time:~6,1%*1000 + %time:~7,1%*100 + %time:~9,1%*10 + %time:~10,1%

set /a realtime = %EndMS%-%StartMS%

echo %realtime%ms

这是执行的例子，测试PHP 5.3、5.4、5.5 不同版本的运行速度：

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F:BAK>time.bat F:BAKphp-5.3.27php.exe primes.benchmark.php

PHP version 5.3.27

Found 148933 prime numbers.

867ms

F:BAK>time.bat F:BAKphp-5.4.19php.exe primes.benchmark.php

PHP version 5.4.19

Found 148933 prime numbers.

759ms

F:BAK>time.bat F:BAKphp-5.5.4php.exe primes.benchmark.php

PHP version 5.5.4

Found 148933 prime numbers.

733ms