What does the error message "mysqli object is already closed" imply?

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The error message "mysqli object is already closed" generally implies that an attempt has been made to use a mysqli object that has already been closed. This error typically occurs when the object has been closed either manually by the developer or automatically by the system. Once the object is closed, it cannot be used to perform any further database functions, and attempting to do so will result in this error. To resolve this issue, the mysqli object must be re-initialized before it can be used again.