1. python 内 xrange(3)的结果是 0,1,2
2. 这种场景就是 JIT 的性能强悍啊

realpg@TestingServer17:/tmp/demo$ python python.py
95549999
15.7798058987
realpg@TestingServer17:/tmp/demo$ pypy python.py
95549999
0.574637174606
realpg@TestingServer17:/tmp/demo$ /usr/local/php5/bin/php php.php
95550000
7.9244079589844
realpg@TestingServer17:/tmp/demo$ /usr/local/php7/bin/php php.php
95550000
3.8246450424194


python2.7 python.py 代码同楼主

php.php 代码
<?php
$time_start = microtime(true);
for ($i=0;$i<95550000;$i++) {
$i+=100;
$i-=100;
}
$time_end = microtime(true);
$time = $time_end - $time_start;
echo "{$i}\n{$time}\n";