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mysqli_query() in different php directories: Couldn't fetch mysqli
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null 2020-07-11 17:46:16
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I encountered a very confusing problem. There is nothing wrong with the MYSQLI connection.

/index.php //Execute mysqli update successfully

/admin/index.php //Execute mysqli update failed

And the database configuration file is in /core/database. php

##----

How to solve this problem? 

Warning: mysqli_query(): Couldn't fetch mysqli in D:\wwwroot\admin\index.php on line 14

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