原因：是PHP有兩種方式添加擴展模塊，一種是直接編譯進了PHP，另外一種是通過共享模式添加模塊，並在php.ini配置文件中配置相應的模塊。以上問題出現的原因是我們需要的模塊已經編譯進PHP了，但是我們有通過共享模塊再次加重了改模塊，這樣就導致重復加重。
在php.ini中找到下面並注釋
;extension=mysqli
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