1、添加了一个$_i变量，它跟$_num相似，但是从0开始；
2、可以使用“PHP原生”的if比较语句。
二、0.10.2版本：
已经完美支持php7.0
github网址：
-------------------------------------------以下是官方发行说明------------------------------------
released this
on 26 Jun 2015
· to master
since this release
- FIX: added predefined constant $_i - loop identifier, same as $_num, but starts from 0.
- FIX: "native" if, also fixes some logical errors (thanks to Nicolas Van Eenaeme)
- FIX: arginfo added and a couple of other minor fixes (thanks to Anton "tony2001" Dovgal)*
- FIX: zephir integration fix (plain blitz::__construct declaration)
Also if/unless logic was unified across both function-like and context-like styles,
so you can finally use things like {{ if (a>b && c, "true", "false") }}.
Enjoy.