原因：是PHP有两种方式添加扩展模块，一种是直接编译进了PHP，另外一种是通过共享模式添加模块，并在php.ini配置文件中配置相应的模块。以上问题出现的原因是我们需要的模块已经编译进PHP了，但是我们有通过共享模块再次加重了改模块，这样就导致重复加重。
在php.ini中找到下面并注释
;extension=mysqli
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