Why is my PHP script throwing 'mysqli::query(): MySQL Object Already Closed or Unable to Fetch MySQL Error'?

mysqli::query(): MySQL Object Already Closed or Unable to Fetch MySQL Error

Problem

While executing a PHP script, you encounter the following errors:

• PHP 7: mysqli::query(): Couldn't fetch MySQL in [script_path] on line [line_number]
• PHP 8: Uncaught Error: MySQL object is already closed

Explanation

These errors indicate that your PHP script is attempting to perform a MySQL query after the MySQL connection object has been closed.

Solution

Ensure that your MySQL connection object is still active before executing any queries.

// Check if the MySQL connection is open
if ($mysqli->connect_error) {
    // Handle the connection error
} else {
    // Execute the query
    $result = $mysqli->query($query);
}

Possible Causes

• Closing the connection too early: Ensure that you close the MySQL connection only after all queries have been executed.
• Destructor issues: Avoid closing the MySQL connection in the destructor (__destruct) method of a class if there are still queries that need to be performed.
• Incorrectly declared connection variables: Check that the MySQL connection variable ($mysqli in this case) is declared and assigned correctly throughout your script.

Additional Notes

• In the provided code snippet for the class EventCalendar, the MySQL connection is closed in the destructor (__destruct) method. This could be an issue if queries are still needed after the destructor is called.
• Ensure that you are using the correct PHP version and MySQL extension.
• Check the MySQL server logs for any additional error messages.

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