When logging in to the background, it always prompts that the database configuration is not defined, but the database configurations of Application/User/Conf/config.php and Application/Common/Conf/config.php are Correct, the front desk can also add, delete, modify and check the database, but the back desk cannot log in. What's going on? 
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小伙看你根骨奇佳，潛力無限，來學(xué)PHP伐。
I have never used this thing, but I don’t know if you have used xdebug. You can debug it step by step. Using this tool well will also be very useful for subsequent code-level debugging.
Take a look at the source code of onethink and see if the db_type in config.php does not match or is written incorrectly
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