Error handling in codeigniter

Question

In my project, to catch all the PHP errors, I created an error handling mechanism as follows:

• I set error_reporting() in an index.php file that overrides anything in the php.ini
• The error handler is installed in system/codeigniter/CodeIgniter.php using set_error_handler - this error handler, _exception_handler , is found in system/codeigniter/Common.php
• The _exception_handler function ignores _exception_handler errors, calls show_php_error from the system exception library if the severity is what your error_reporting() function indicates in index.php and logs the error according to what you set in your config.php file
• The handler returns FALSE , so after that PHP continues to process however, as a rule, this will correspond to your level of error_reporting and display_errors .

What puzzles me is that the errors are E_ERROR , i.e. fatal errors do not fall into _exception_handler at _exception_handler . It's not only that show_php_error not being called, it looks like the function is just not being called for them. This is obviously a problem, as it means that they arent processed by show_php_error or are logged. For example, if I intentionally make a mistake $this->load->views('foo'); in the controller, the handler will not be called.

Any suggestion on error handling would be greatly appreciated, thanks!

Answer 1

Now this is a pretty big discussion: Should you catch fatal errors or not. Some say they are FATAL, so you don’t know what state the system is in, but I’ll go with “try to clean up if an error occurs”. To catch ALL fatal errors, you need to configure the pre_system binding. go to application / config / hooks.php and type

 $hook['pre_system'][] = array( 'class' => 'PHPFatalError', 'function' => 'setHandler', 'filename' => 'PHPFatalError.php', 'filepath' => 'hooks' ); 

after that go to the hooks directory and add the handling of this error:

 <?php class PHPFatalError { public function setHandler() { register_shutdown_function('handleShutdown'); } } function handleShutdown() { if (($error = error_get_last())) { ob_start(); echo "<pre>"; var_dump($error); echo "</pre>"; $message = ob_get_clean(); sendEmail($message); ob_start(); echo '{"status":"error","message":"Internal application error!"}'; ob_flush(); exit(); } } 

as you can see, we use the register_shutdown_function function to run a function that checks if an error has occurred and if it emailed it to the developer. This setup has been working flawlessly for over two years in several CI projects I have worked with.

Answer 2

I found this answer on a different question ( https://stackoverflow.com/a/3/3128/ ) and I think this is also useful for anyone reading this question. "To handle codeigniter-specific errors, you can override your Exception library class by creating the My_Exception class in the applications / libraries folder. Copy the original library library signatures into it and enter the code. Work."