How to fix \'Fatal error: Uncaught exception \'mysqli_sql_exception\' with message \'No index used in query/prepared statement\'\' in PHP?

An error can occur when you run your code that states "Fatal error: Uncaught exception 'mysqli_sql_exception' with message 'No index used in query/prepared statement'."

The error message "No index used in query/prepared statement" is not the root cause of the fatal error; rather, it is a warning from MySQL indicating that an index was not utilized during the query execution, which can result in slower performance. This warning is typically not severe enough to cause a fatal error.

The true source of the fatal error in this case is your PHP code, which is brought on by three factors:

1. mysqli reports numerous warnings, even under circumstances that are relatively benign.
2. You have configured mysqli_report(MYSQLI_REPORT_ALL), causing your program to treat both errors and warnings as mysqli_sql_exception exceptions.
3. Your PHP code is not catching this exception, meaning it is not encapsulated in a try{} block with a corresponding catch(){} block. As a result, uncaught exceptions are deemed fatal.

You cannot resolve the first problem, as indicated in the other response. Consequently, you can either alter your mysqli_report(...) configuration to MYSQLI_REPORT_STRICT or MYSQLI_REPORT_OFF or, indeed, to any setting other than MYSQLI_REPORT_ALL.

(Edit: w3d offers a compelling explanation for this in their comment below, recommending mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT) as a viable alternative.)

For best practices and to use this feature effectively, you should adopt the best practice of utilizing try{} and catch(){} blocks appropriately throughout your code.

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