php在什么情况下需要用c扩展了，求大牛指导，说一下具体的应用场景，十分感激！
php在什么情况下需要用c扩展了，求大牛指导，说一下具体的应用场景，十分感激！
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php在什么情况下需要用c扩展了，求大牛指导，说一下具体的应用场景，十分感激！
- 遇到性能瓶颈时进行性能优化，比如密集计算、大量字符串处理等等
- 跨进程通信、共享数据，比如全局数据表、配置文件、数据库连接池等等
- php中需要用到一些本地C库或可执行文件中的功能，这些功能又没有PHP实现，比如imagemagick这种图片处理工具
我根据实际遇到的事说一下吧，我做个两次扩展，一次是调用公司的一个ID生成程序，程序是C写的（内部有些成熟的算法，拿PHP再写一遍反而麻烦）；另一次是要用到 V8JS 但是它又偏偏不能完全满足我们的需求，所以改了下源码（其实这已经不算自己扩展，还是从 PECL 拿来的）。
我觉得什么性能、进程通讯、共享数据其实都不是必须要扩展。1.你究竟需要PHP提升多少性能呢？PHP的优势在WEB开发方便，成熟的组件和框架多，而非性能 2.进程通讯有pcntl和posix，信号、管道都不在话下（不过老实说不如perl多进程来的爽） 3.共享数据找个NoSQL数据库更适合，如果需要实时处理得，消息队列之类的应用也不少。
所以，我觉得真正需要扩展的主要还是受环境所迫，有个程序自己人搞的，他偏偏就没有PHP版，你怎么办呢。当然也可能因为性能的考虑部分核心组件用C写，但是有这样要求的项目似乎极少，至少我经历的工作，如果一定要求高性能的都上分布式计算了，通过自定接口或消息队列交互数据，或者计划任务定时触发，或者任务队列批量处理，根本不会与web系统混合在一起。
生成激活码什么的,加解密的函数用c写了扩展
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