关于set_time_limit（0）的有关问题
关于set_time_limit（0）的问题？
请问在iis服务器下，php中的set_time_limit（0）为什么没有作用?
------解决方案--------------------
几个原因排查一下：
1. php是否运行在安全模式下，如果是的话，set_time_limit是无效的。
2. IIS服务器本身配置了超时，且优先级更高，即使你 php设置了不超时，由于服务器的超时机制，还是会做超时处理，因此在超时后会触发致命错误，这就是导致500错误的原因。
参考一下这篇文章：http://www.iisadmin.co.uk/?p=7
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