Custom exceptions in CodeIgniter

Question

I want to extend the exception class that returns custom message when getMessage is called.

class MY_Exceptions extends CI_Exceptions{
     function __construct(){
        parent::__construct();
    }
    function getMessage(){
        $msg = parent::getMessage();
        return "ERROR - ".$msg;
    }
}

MY_Exceptions is placed in core folder. And the exception throwing / handling is as follows:

try{
    throw new Exception('a message');
}catch (Exception $e) {
        echo $e->getMessage();
}

The intention is to get "ERROR - a message". But it always returns "a message". When I try debugging, the control never goes to MY_Exception class. Is there anything that I am missing?

First off your exception is not "custom" its normal exception with a message, custom exception is something like MyCustomException('message');, I looked at exceptions.php (in CI's system/core) and it seems that CI_Exceptions does not extend php exception. Please do further reading here. — Kyslik
– Kyslik, Commented Dec 12, 2014 at 18:31

Kyslik · Accepted Answer · 2014-12-12 18:38:43Z

7

Create file core/MY_Exceptions.php

<?php
if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class MY_Exceptions extends Exception {

    public function __construct($message, $code = 0, Exception $previous = null) {
        parent::__construct($message, $code, $previous);
    }

    // custom string representation of object
    public function __toString() {
        return __CLASS__ . ": [{$this->code}]: {$this->message}\n"; //edit this to your need
    }

}

class MyCustomExtension extends MY_Exceptions {} //define your exceptions

answered Dec 12, 2014 at 18:38

Kyslik

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4 Comments

luis.ap.uyen Over a year ago

This helped me to create my own Exceptions in CI. Thank you!

Vimal Maheedharan Over a year ago

@luis.ap.uyen - I know its too late, but can you share the implementation

Kyslik Over a year ago

@VimalMahi are you on legacy project? If not and you are just starting; see other frameworks (like Laravel) instead; way better learning curve with laracasts.com etc.

Vimal Maheedharan Over a year ago

Thanks for the revert @Kyslik! Will definitely look into Laravel

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