为什么很多人说php不适合开发大型网站但很多大型网站用php开发？
网站说，"PHP不适合开发大型网站，因为：
1）对递归的不良支持
2）许多PHP模块都不是线程安全的
3）PHP 由于商业原因而不健全
4）没有命名空间
5）不标准的日期格式字符
6）混乱的许可证
7）不一致的函数命名规则
8）魔法引用的地狱
9）缺少标准框架，如MVC"
但很多大型网站是用php做的，为什么呢？
"Google(以前是php，后来换python了?),
facebook(历史遗留，一部分换成python了),
亚马逊(www.amazon.com),
mysql.com,
php.net,
百度(前端用php，后台核心都用C/C++),
优酷，
腾讯，
51job.com,
DEDECMS(织梦)
sohu.com(前端用php，后端还是java/c++做),
sina.com,
163.com,
tom.com,
YAHOO.com,
阿里巴巴，
美国国家宇航局NASA,民用信息发布系统等, "
------解决方案--------------------
1）对递归的不良支持
2）许多PHP模块都不是线程安全的
3）PHP 由于商业原因而不健全
4）没有命名空间
5）不标准的日期格式字符
6）混乱的许可证
7）不一致的函数命名规则
8）魔法引用的地狱
9）缺少标准框架，如MVC"
-----------------------
第二条确实有问题，其他都不是问题！
------解决方案--------------------
现在有“混合语言开发”一词。
php在表现层表现还是出众的，开发很高效，快捷。
c/c++能操作mysql，php也能操作mysql，拿百度来说，用c/c++采集，用php表现。
大公司会用很多开发语言和工具，对高手来说，开发语言从来不是问题（包括现学）。
------解决方案--------------------
刚看了个图,大家一起分享一下 哈哈
------解决方案--------------------
php学习成本很低，和C基本是一样的东西，但是反而多了很多方便的库，所以对于性能要求低的程序都可以拿PHP开发，不仅仅是拿来写CGI而已。
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