网站运行一段时间后,一些目录下出现一些core.文件,请教是什么?有什么用?如何用?出现这个正常吗?是否需要使其不出现?怎么使其不出现

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Release: 2016-06-13 12:41:50
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网站运行一段时间后,一些目录下出现一些core.*文件,请问是什么?有什么用?怎么用?出现这个正常吗?是否需要使其不出现?如何使其不出现?
如题...

求教 

环境是nginx1.1.2   centos5.8  php5.3.6

core.* Nginx CentOS PHP5
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