db get和view文件的日志消息

Question

I want to provide the custom error log to debug a internal server error in codeignitor.

I have used the try and catch to catch any error in the lines of code but no success.Generic Logs are being generated(from system folder),if I am querying some wrong table.When I checked the database query builder file, I found that errors are being handled by the internal file but it is not throwing any Exception or error(script is safely ending after generating the log and displaying error).

try{ 
    $data['tags'] = $_SESSION['tags'];
    $data['accId'] = isset($_POST['accId']) ? $_POST['accId'] : '';
    $data['categorySelectionList']=$_SESSION['categorySelectionList'];
    $data['accountSelectionList'] = $_SESSION['accountSelectionList'];
    $_SESSION['transDescList'] = '';
    $this->load->model('Transactions_model');
    $data['transDescList'] = !empty($_SESSION['transDescList']) 
        ? $_SESSION['transDescList'] 
        :  $this->Transactions_model->getTransDescList($this->uid,$_SESSION['tbl_transactions']);
    $this->load->view('frontend/accounts/addTransaction', $data);
}catch(Error $e){
    log_message('error', 'There is a error by the user ');
} 

Is there any way to produce the custom log from my file like userid, few session data without affecting the core files.

Note: Although I have achieve this with the help of ajax request.If the request fails i simply make another request to generate the custom log from xhr.responseText.But I want to know if there is any way to achieve this without affecting the core files

Answer 1

To log your error in codeigniter crate core/MY_Exceptions.php file to handle customer error.

Here is Demo of core/MY_Exceptions.php file

class MY_Exceptions extends CI_Exceptions{


/*
 * Class constructor
 *
 * @return  void
 */
public function __construct()
{
    $this->ob_level = ob_get_level();
    /* Note: Do not log messages from this constructor.*/
}


/**
 * Exception Logger
 *
 * Logs PHP generated error messages
 *
 * @param   int $severity   Log level
 * @param   string  $message    Error message
 * @param   string  $filepath   File path
 * @param   int $line       Line number
 * @return  json response
 */
public function log_exception($severity, $message, $filepath, $line)
{
    /*
     *  default log this
     *  and user will get a message of server error
     */
    $severity = isset($this->levels[$severity]) ? $this->levels[$severity] : $severity;
    log_message('error', 'Severity: '.$severity.' --> '.$message.' '.$filepath.' '.$line);

    $response = array(
        'status' => 'Error',
        'error' => '1',
        'message' => 'Server Error ! Please contact administrator !'
    );
    echo json_encode($response);exit;
}


/**
 * 404 Error Handler
 *
 * @uses    CI_Exceptions::show_error()
 *
 * @param   string  $page       Page URI
 * @param   bool    $log_error  Whether to log the error
 * @return  json response
 */
public function show_404($page = '', $log_error = TRUE)
{
    if (is_cli())
    {
        $heading = 'Not Found';
        $message = 'The controller/method pair you requested was not found.';
    }
    else
    {
        $heading = '404 Page Not Found';
        $message = 'The page you requested was not found.';
    }

    /*
     *  default log this
     *  and user will get a message of server error
     */
    if ($log_error)
    {
        log_message('error', $heading.': '.$page);
    }

    $response = array(
        'status' => 'Error',
        'error' => '1',
        'message' => $message
    );
    echo json_encode($response);exit;
}


/**
 * General Error Page
 *
 * Takes an error message as input (either as a string or an array)
 * and displays it using the specified template.
 *
 * @param   string      $heading    Page heading
 * @param   string|string[] $message    Error message
 * @param   string      $template   Template name
 * @param   int     $status_code    (default: 500)
 *
 * @return  json response
 */
public function show_error($heading, $message, $template = 'error_general', $status_code = 500)
{
    /*
     *  default log this
     *  and user will get a message of server error
     */
    log_message( 'error', print_r($heading,true).': '. print_r($message,true) );

    $response = array(
        'status' => 'Error',
        'error' => '1',
        'message' => 'Server Error ! Please contact administrator !'
    );
    echo json_encode($response);exit;
}


public function show_exception($exception)
{
    /*
     *  default log this
     *  and user will get a message of server error
     */
    log_message( 'error', $exception->getMessage() );

    $response = array(
        'status' => 'Error',
        'error' => '1',
        'message' => 'Server Error ! Please contact administrator !'
    );
    echo json_encode($response);exit;

}


/**
 * Native PHP error handler
 *
 * @param   int $severity   Error level
 * @param   string  $message    Error message
 * @param   string  $filepath   File path
 * @param   int $line       Line number
 * @return  json response
 */
public function show_php_error($severity, $message, $filepath, $line)
{
    /*
     *  default log this
     *  and user will get a message of server error
     */
    $severity = isset($this->levels[$severity]) ? $this->levels[$severity] : $severity;
    log_message('error', 'Severity: '.$severity.' --> '.$message.' '.$filepath.' '.$line);

    $response = array(
        'status' => 'Error',
        'error' => '1',
        'message' => 'Server Error ! Please contact administrator !'
    );
    echo json_encode($response);exit;
}

}

You can log your error and set response as you wish.