I've been into a requirement from my job, and i think this works well and I suppose that are other colleagues that would use this functions so they save all the error data related to MySQLi so here is my contribution to this excellent library

methods:

Main function to generate the error from querys:
errorTrack($insertData = null,$case_err="")

Function that help us to populate our file with all the data recolected from errorTrack function
private function createLog($data)

Properties: 
   //Boolean variable to set the errorTrack method
    protected $errTrack = false;
   //String variable to set the route where the file will be created
    protected $routeTrack;

Example of use



 /**
     * Execute sql sentence with parameters
     * @param string $sql SQL sentence
     * @param array $params All parameters necessary for the query
     * 
     * @return int Result
     * */
    public static function execute($sql,$params){
        
        //Set the errorTrack method
        self::getInstance()->setErrTrack(true);

        //Execute Query
        $result = self::getInstance()->rawQuery($sql, $params);     

        //Return result
        return $result;        
    }

This methods and properties have been tested with INSERT,UPDATE,DELETE sentences working OK.

Now the query shows all the parameters in its place, insted of ? symbols in the query.

It was showing the mysqli->error twice! Now it is corrected