CodeIgniter 4 Error Handling

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CodeIgniter 4 Error Handling

CodeIgniter 4 Error Handling , we will see the set of exceptions and error logging that we can use in the framework codeigniter

Configuration exceptions

throw new \CodeIgniter\Exceptions\ConfigException(); :  When using this exception in our application, it shows us the message CodeIgniter\Exceptions\ConfigException , use code 3

throw new \CodeIgniter\Exceptions\ConfigException();

Database Exceptions

throw new \CodeIgniter\Database\Exceptions\DatabaseException(); :  When using this exception in our application, it shows us the message CodeIgniter\Database\Exceptions\DatabaseException , use code 8

Exceptions with 404 status codes

throw \CodeIgniter\Exceptions\PageNotFoundException::forPageNotFound(); : When using this exception in our application, it shows us the message 404 – File Not Found – Page Not Found 

throw \CodeIgniter\Exceptions\PageNotFoundException::forEmptyController(); : When using this exception in our application, it shows us the message 404 – File Not Found – No Controller specified. an example of implementation is to use it in a system with Authorization to hide a route associated to a method

throw \CodeIgniter\Exceptions\PageNotFoundException::forControllerNotFound(); : When using this exception in our application, it shows us the message Too few arguments to function CodeIgniter\Exceptions\PageNotFoundException::forControllerNotFound(), , since it is necessary to add 2 parameters

throw \CodeIgniter\Exceptions\PageNotFoundException::forMethodNotFound(); : When using this exception in our application, it shows us the message Too few arguments to function CodeIgniter\Exceptions\PageNotFoundException::forMethodNotFound(), , since you need to add 1 parameter

Redirect exceptions

throw new \CodeIgniter\Router\Exceptions\RedirectException(); : Redirect exceptions redirect us to the base url unless we pass a route as a parameter, the status code is 302, A practical way to use this functionality is when creating a login

Log and error handling

In the environment variable file named .env , we enable error logging on codeigniter 4, removing the hash # sign

#--------------------------------------------------------------------
# LOGGER
#--------------------------------------------------------------------

 logger.threshold = 4

Now let’s make some syntax error in our application, for example we forgot to put a semicolon at the end of this statement

return $this->response->setJSON($access)

Which would show us the error log and its cause in the file writable/logs/log-year-month-day.log

Codeigniter 4 logs
These were some ways to use CodeIgniter 4 Error Handling

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