Why is my PHP mysqli object closing prematurely, causing 'mysqli object is already closed / couldn't fetch mysqli error'?

mysqli::query(): mysqli object is already closed / couldn't fetch mysqli error

The provided PHP code utilizes a class (EventCalendar) that manages database connections and executes queries. However, the error message suggests that the mysqli object is already closed or an error occurred while fetching the mysqli error.

Understanding the Error

When the mysqli object is closed prematurely, subsequent queries will fail with the "mysqli object is already closed" error. This could occur if the DBConnect object is closed before all the queries have been executed.

The secondary part of the error, "couldn't fetch mysqli error," indicates that the script attempted to retrieve the error message associated with the previous mysqli operation, but the error message could not be retrieved, possibly due to the closed connection.

Resolving the Issue

Ensure that the DBConnect object is not closed until after all necessary queries have been executed. In the provided code, the DBConnect object is closed in the __destruct() method. Move the actual connection termination to a more appropriate place, such as after all queries have executed and the object is no longer needed.

Additionally, consider checking the connection's status before executing queries to handle potential connection issues gracefully.

Revised Code Example

Here's a revised portion of the code that addresses the potential closure issue:

// Function to add events to Zodiac calendar

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