laravel/application/config/error.php

<?php

return array(

	/*
	|--------------------------------------------------------------------------
	| Error Detail
	|--------------------------------------------------------------------------
	|
	| Detailed error messages contain information about the file in which an
	| error occurs, as well as a PHP stack trace containing the call stack.
	|
	| If your application is in production, consider turning off error details
	| for enhanced security and user experience. The error stack trace could
	| contain sensitive information that should not be publicly visible.
	|
	*/

	'detail' => true,

	/*
	|--------------------------------------------------------------------------
	| Error Logging
	|--------------------------------------------------------------------------
	|
	| When error logging is enabled, the "logger" Closure defined below will
	| be called for every error in your application. You are free to log the
	| errors however you want. Enjoy the flexibility.
	|
	*/

	'log' => false,

	/*
	|--------------------------------------------------------------------------
	| Error Logger
	|--------------------------------------------------------------------------
	|
	| Because of the various ways of managing error logging, you get complete
	| flexibility to manage error logging as you see fit. This function will
	| be called anytime an error occurs within your application and error
	| logging is enabled. 
	|
	| You may log the error message however you like; however, a simple log
	| solution has been setup for you which will log all error messages to
	| a single text file within the application storage directory.
	|
	| Of course, you are free to implement more complex solutions including
	| e-mailing the exceptions details to your team, etc.
	|
	*/

	'logger' => function($e, $config)
	{
		$format = '%s | Message: %s | File: %s | Line: %s';

		$message = sprintf($format, date('Y-m-d H:i:s'), $e->getMessage(), $e->getFile(), $e->getLine());

		File::append(STORAGE_PATH.'log.txt', $message.PHP_EOL);
	}

);