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<?php
// Name of function same as mentioned in Hooks Config
function db_log_queries()
{
    $CI = & get_instance();

    // check if database logging is enabled (see config/config.php)
    if($CI->config->item('db_log_enabled'))
    {
        // Creating Query Log file with today's date in application/logs folder
        $filepath = APPPATH . 'logs/Query-log-' . date('Y-m-d') . '.php';
        // Opening file with pointer at the end of the file
        $handle = fopen($filepath, "a+");

        // Get execution time of all the queries executed by controller
        $times = $CI->db->query_times;
        foreach ($CI->db->queries as $key => $query)
        { 
            // Generating SQL file alongwith execution time
            $sql = $query . " \n Execution Time:" . $times[$key];
            // Writing it in the log file
            fwrite($handle, $sql . "\n\n");
        }

        // Close the file
        fclose($handle);
    }
}
?>