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Call to undefined function getInstance()咋回事

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Release： 2016-06-13 10:33:43
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Call to undefined function getInstance()怎么回事
运行程序时出现了：

Fatal error: Call to undefined function getInstance()

这样的错误是怎么回事，getInstance不是php自带的函数吗？还是需要开启php的什么扩展，php.ini需要配置什么才行吗？

------解决方案--------------------
http://codeigniter.org.cn/user_guide/general/creating_libraries.html 看下这个吧，里面有对它的一些简单介绍

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