PHP7性能获得得极大的提升，下面是我搜集的一些测试案例：
PHP7 VS HHVM (WordPress)
HHVM vs PHP 7 – The Competition Gets Closer!
PHP 7.0 Is Showing Very Promising Performance Over PHP 5, Closing Gap With HHVM
PHP之父：PHP7 性能翻倍关键大揭秘
PHP7革新与性能优化