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# 新特性

- [可为空（Nullable）类型](https://php7.shujuwajue.com/php-71x-xin-te-xing/xin-te-xing/ke-wei-kong-ff08-nullable-ff09-lei-xing.md)
- [对称阵列解构](https://php7.shujuwajue.com/php-71x-xin-te-xing/xin-te-xing/dui-cheng-zhen-lie-jie-gou.md)
- [Void 函数](https://php7.shujuwajue.com/php-71x-xin-te-xing/xin-te-xing/void-han-shu.md)
- [类常量访问权限控制](https://php7.shujuwajue.com/php-71x-xin-te-xing/xin-te-xing/lei-chang-liang-private-protected-public-quan-xian-kong-zhi.md)
- [多异常捕获处理](https://php7.shujuwajue.com/php-71x-xin-te-xing/xin-te-xing/duo-yi-chang-bu-huo-chu-li.md)
- [list()现在支持键名](https://php7.shujuwajue.com/php-71x-xin-te-xing/xin-te-xing/listxian-zai-zhi-chi-jian-ming.md)
- [支持为负的字符串偏移量](https://php7.shujuwajue.com/php-71x-xin-te-xing/xin-te-xing/zhi-chi-wei-fu-de-zi-fu-chuan-pian-yi-liang.md)
- [补充\*其他特性与变更](https://php7.shujuwajue.com/php-71x-xin-te-xing/xin-te-xing/bu-5145-qi-ta-te-xing-yu-bian-geng.md)