PHP7卓越性能背后的原理有哪些？
作者：韩天峰
链接：http://www.zhihu.com/question/38148900/answer/75115687
来源：知乎
减少内存分配次数，多使用栈内存，缓存数组hash值，字符串解析成参数改为宏展开，使用大块连续内存代替小块内存等等。更细节信息请看鸟哥的PHP7分享PPT。zend引擎程序的性能提升了很多，PHP程序性能自然好了。所有的优化都是很实在的，从细节入手积少成多。
想办法去优化一个有20年历史的程序，这是一件非常有挑战性的事情，比推倒重构难度更高。世界上有80%的网站用PHP，使用PHP7后这些网站程序无太大成本就能免费得到1倍性能提升。将节约多少CPU，节约多少电力，减少多少碳排放。另外PHP是开源项目，背后没有商业公司，完全由社区运作。使用PHP语言的开发者和企业从未向PHP官方付过一分钱。所以建议各位知友口下留德，无论您多么鄙视PHP，但请尊重别人为世界所做的付出。
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