How Can I Handle MySQLi Warnings to Prevent Fatal Errors in PHP?

mysqli_sql_exception: No Index Used in Query

The issue mentioned in the given code is not a fatal error but a warning indicating the absence of an index in the query. MySQL issues warnings for this condition, but it's not a critical error unless it significantly affects performance.

However, the fatal error that triggers the exception is not related to MySQL. It's caused within the PHP code itself.

Root Cause of the Fatal Error

There are three main factors contributing to the fatal error:

1. mysqli_report settings: By setting mysqli_report(MYSQLI_REPORT_ALL), you're instructing PHP to log all errors and warnings, including harmless ones.
2. mysqli throws all errors as exceptions: If you throw all errors and warnings as mysqli_sql_exception, this increases the chances of unhandled exceptions.
3. Lack of exception handling: The code doesn't utilize a try{} block with a catch(){} block to handle exceptions. Uncaught exceptions are classified as fatal errors.

Solutions:

To resolve this issue, you have two options:

1. Change mysqli_report settings: Modify mysqli_report(...) to use MYSQLI_REPORT_STRICT or MYSQLI_REPORT_OFF. This will reduce the number of errors and warnings reported.
2. Implement proper exception handling: Within your PHP code, encompass the database operations with a try{} block and handle any potential mysqli_sql_exception in a catch(){} block. This ensures that the exceptions are handled gracefully and don't lead to fatal errors.

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