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求助:关于Fatal error: Call to a member function XXXX on a non-object in

求助:关于Fatal error: Call to a member function XXXX on a non-object in

我在用PHP开发程序时,经常会出现这类错误:Fatal error:  Call to a member function XXXXXX on a non-object in。。。。错误。比如:
Fatal error:  Call to a member function fetchNextObject() on a non-object in。。。。,这个错误与fetchNextObject()有什么关系?此类错误主要因什么产生的?不知那位高手能解答下具体原因??在下万分感激!QQ:123580891 wono@sohu.com

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